Indian Journal of Agricultural Research

  • Chief EditorT. Mohapatra

  • Print ISSN 0367-8245

  • Online ISSN 0976-058X

  • NAAS Rating 5.60

  • SJR 0.293

Frequency :
Bi-monthly (February, April, June, August, October and December)
Indexing Services :
BIOSIS Preview, ISI Citation Index, Biological Abstracts, Elsevier (Scopus and Embase), AGRICOLA, Google Scholar, CrossRef, CAB Abstracting Journals, Chemical Abstracts, Indian Science Abstracts, EBSCO Indexing Services, Index Copernicus
Submit

Full Research Article

Physiological and Biochemical Basis of Variation in Yield of Rice (Oryza sativa L.) under CA-based Crop Establishment Methods and Nutrient Management in R-W Cropping System

R.V. Bhangare1,*, U.P. Singh2, S. Jangde1, P. Prakash1
1Department of Plant Physiology, Institute of Agricultural Sciences, Banaras Hindu University, Varanasi-221 005, Uttar Pradesh, India.
2Department of Agronomy, Institute of Agricultural Sciences, Banaras Hindu University, Varanasi-221 005, Uttar Pradesh, India.

ABSTRACT

Background: Crop establishment methods and nutrient management practices treatments were continuously practiced in the same plots since 2011-12 as a part of long-term experiment. A field study was conducted during 2019-2020 and 2020-2021 i.e. during 9th and 10th year of study to investigate the effects of CE methods and nutrient management on growth, physiological, biochemical, yield attributes and yield of rice crop.

Methods: Field experiments were carried out at the Agricultural Research Farm, Banaras Hindu University, Varanasi, laid out in split plot design replicated thrice with four crop establishment (CE) methods viz., CT (puddled transplanted) rice-CT wheat (CE1),CTDSR rice-CT wheat (CE2), CTDSR- ZT wheat (rice residue retention) (CE3), ZT rice-ZT wheat (residue retention in rice and wheat) (CE4) in main plots and three nutrient management (NM) practices viz., FP (164 kg N, 50 kg P2O5, 32 kg K2O and 4 kg Zn ha-1) (N1), RFD (150 kg N, 60 kg P2O5, 60 kg K2O and 5 kg Zn ha-1) (N2) and SSNM- RWCM recommendation (N3). The rice variety used was ‘Sarju-52’ in the present study.

Result: The recorded data revealed that ZT rice–ZT wheat (CE4) recorded significantly higher plant height, tillers hill-1, leaf area, RWC, total chlorophyll content and protein content as compared to other CE methods. Among NM practices, SSNM-RWCM (N3) recorded significantly higher plant height, tillers hill-1, leaf area and protein content, whereas, RWC and total chlorophyll content did not differ significantly over farmer’s practice and recommended fertilizer dose. Improved growth and physio-chemical attributes in ZT rice-ZT wheat (CE4) and SSNM-RWCM (N3) resulted in significantly higher panicles hill-1, fertility percentage and number of filled grains panicle-1 over other CE methods and NM practices. Panicle length, spikelets panicle-1 and test weight showed non-significant differences. Grain yield, straw yield and biological yield were significantly higher in ZT rice-ZT wheat (CE4) among CE methods and SSNM-RWCM (N3) among NM practices. The harvest index showed non-significant differences for CE methods and NM practices both.

INTRODUCTION

Rice is one of the most important cereal crops and rice-wheat production systems are fundamental to employment, income and livelihoods for hundreds of millions of rural and urban poor in South Asia (Jat et al., 2014). Multiple challenges associated with plough-based conventional production practices in rice-wheat rotation there such as declining factor productivity, shrinking farm profits due to increasing energy and labour costs, an emerging irrigation water crisis and recent challenges of climate change leading to a major threat to food security of South Asia. Hence the major challenge is to increase productivity to meet the growing food demand without adverse environmental impact. Long-term experiments are valuable for understanding the relationships between changing soil and crop management practices and productivity. The traditional practice of manually transplanting of rice seedlings in random geometry after intensive dry and wet tillage and conventionally tilled broadcast seeding of wheat contributes significantly to these challenges, making this system unsustainable. This practice is water, capital and energy-intensive and deteriorates soil health (Sharma et al., 2003). Puddling leads to the formation of a hard pan at shallow depths deteriorates the soil’s physical properties and delays the planting of a succeeding wheat crop. Timely planting of wheat is crucial as yield reductions of 1-1.5% per day occur for each day after the optimum sowing date, November 15 in the IGP (Hobbs and Morris, 1996). In addition, a hard pan at shallow depths created by repeated puddling inhibits root elongation of the post-rice crop, which can ultimately reduce crop yield (Boparai et al., 1992). Direct seeding is an attractive alternative to transplanting rice to reduce labour input, drudgery in farming and the cost of cultivation. Rice is direct-seeded either by dry seeding primarily in rainfed areas and/or by wet seeding in irrigated areas. In India and Nepal, experiments evaluated dry-seeded rice with no soil puddling as an alternative to puddled transplanted rice followed by zero-till or conventional-tilled wheat (Hobbs et al., 2002). Published studies demonstrate an 8% reduction in wheat yield when sown after puddled transplanted rice compared with wheat sown after direct sown rice in non-puddled conditions (Kumar et al., 2008). In the conventional systems involving intensive tillage, there is a gradual decline in soil organic matter through accelerated oxidation and burning of crop residues causing pollution, greenhouse gases emission and loss of valuable plant nutrients. Conservation agriculture practices are recognized as a powerful tool to address the issues related to land and environmental degradation. CA has great relevance to restore the degraded ecologies where farm income and fatigue in yield have become major concerns. Conservation technologies involve minimum soil disturbance, providing soil cover through crop residues or other cover crops and crop rotations for achieving higher productivity. Resource-conserving technologies such as zero-tillage and un-puddled transplanting has been shown to be beneficial in terms of improving soil health, water use, crop productivity and farmers’ income (Gupta and Sayre, 2007; Gupta and Seth, 2007; Singh et al., 2009). Due to the rising cost of labour and excessive water use in puddling for transplanting rice in the irrigated ecosystems, direct seeding of rice is gaining popularity in south-east Asia (Balasubramanian and Hill, 2002). Direct-seeded rice needs only 34% of the total labour requirement and saves 29% of the total cost of the transplanted crop. ZT is widely adopted in wheat by farmers in the North-western IGP of India, particularly in areas where rice is harvested late. ZT minimizes the loss on account of delayed sowing as it advances the wheat sowing by 10-15 days and also saves the time and cost involved in field preparation (Sharma et al., 2002; Chandana et al., 2010). However, to get the full benefits of ZT, both rice and wheat need to be grown with a ‘double zero-tillage system (Jat et al., 2006; Bhushan et al., 2007). Important factors that are forcing a shift from the traditional puddled-transplanting system to unpuddled direct seeding of rice are shortages of labour and water and escalating fuel prices. Successful implementation of a conservation agriculture system depends to a large extent on a good understanding of the dynamics of nutrients in the soil and nutrient management which requires serious attention. Involuntarily on the part of the farming community in the adoption of zero tillage sowing of rice wheat in a large area is mainly due to associated with the management of nutrients. Nutrients are driven by an interaction of several factors; tillage, doses, timing and type of fertilizer management practice. The present study was planned to study the growth, physiological and biochemical parameters of rice crop in 2019-20 (9th year and 2020-21 (10th year) of a long-term study started in 2011 to find the suitability and discuss the variation of the yield of four CE methods and three NM practices in the rice-wheat cropping system.

MATERIALS AND METHODS

Treatments and experimental design
 
Field experiments were laid out in split plot design replicated thrice with four crop establishment methods viz., CE1: Conventional till rice (puddled transplanted) - Conventional till wheat (line sowing) [CT rice-CT wheat], CE2: Conventional till direct seeded rice - conventional till wheat (line sowing) [CTDSR rice-CT wheat], CE3: Conventional till direct seeded rice - Zero-till wheat [CTDSR-ZT wheat], CE4: Zero-till direct seeded rice -Zero-till wheat [ZT rice-ZT wheat] in main plots and three nutrient management practices viz., N1: Farmers practice, N2: Recommended fertilizer dose and N3: SSNM-RWCM in subplots during both the years. In zero-till rice plots, the crop was established without any preparatory tillage. In CTDSR treatment the ploughing was done twice with a tractor-drawn cultivator followed by planking. In the CT method, the experimental area was tilled dry and wet followed by puddling with a cage wheel, levelled and thereafter layout was done. Glyphosate (1 kg ha-1) was sprayed in all zero-till treatments before seeding during both years. Recommended herbicides pendimethalin at 1.0 kg a.i. ha-1 as pre-emergence and post-emergence herbicides bispyribac 25 g a.i. ha-1 at 20 DAS/DAT in rice were applied with 500 litter ha-1 of water with the help of a knapsack sprayer, fitted with a flat-fan nozzle.  
 
Crop management
 
Seed Rate and crop geometry
 
In CTDSR and ZT rice treatments sowing was done by using a tractor-drawn zero-till seed-cum-fertilizer planter with a row spacing of 20 cm apart and seeding depth was maintained at 2-3 cm using the depth control wheel of the planter. The rice variety ‘Sarju-52’ was used at the rate of 30 kg ha-1. The seeding was done on 23rd June 2019 and 27th June 2020 in CTDSR and ZT Rice treatments. On the same day, seeds were sown in the nursery for conventional till rice (puddled transplanted) and 30 days old seedlings were manually transplanted in line (farmer’s practice) in both years. 
 
Water management
 
During both years of rice experimentation, satisfactory/sufficient monsoon showers were received. Total rainfall and distribution were more uniform in both years during the crop period. However, during both years one irrigation was provided as pre-sowing irrigation and after sowing and transplanting no irrigation was provided. 
 
Nutrient management
 
Three nutrient management practices viz., Farmers practice (164 kg N, 50 kg P2O5, 32 kg K2O and 4 kg Zn ha-1), Recommended fertilizer dose (150 kg N, 60 kg P2O5, 60 kg K2O and 5 kg Zn ha-1) and SSNM- RWCM recommendation for rice 2019 transplanted, DSR and zero till basal application 39 kg N, 26.5 kg P2O5, 19.5 kg K2O, 5.25 kg Zn ha-1, at active tillering (AT) 45.5 kg N ha-1 and at panicle initiation (PI) 45.5 kg N ha-1 and 19.5 kg K2O ha-1. In 2020 transplanted rice basal application 32.5 kg N, 33.5 kg P2O5, 18 kg K2O and 5.25 kg Zn ha-1, at (AT) 38.5 kg N ha-1 and at (PI) 38.5 kg N and 18.0 kg K2O ha-1 and in DSR and zero till rice basal application 34.5 kg N, 36.0 kg P2O5, 19.5 kg K2O and 5.25 kg Zn ha-1 and at active tillering 40 kg N ha-1 and at panicle initiation, 40 kg N and 19.5 kg K2O ha-1 have been applied in sub-plots during both the years.
 
Growth, physiological, biochemical and yield observations
 
Growth, physiological and biochemical observations presented in this paper was recorded at 80 DAT/ DAS and yield attributes and yield were taken at the harvest stage of rice crop. The plant height was recorded with the help of a meter scale from the base of the plant to the tip of the panicle after heading and expressed in cm. Tillers hill-1 were recorded by counting tillers from the randomly selected hills at 80 DAS/DAT and then averaged. The days taken to 50% of the plants in each plot attained flowering was recorded by counting from the date of sowing/ transplanting and when half of all the plants had already flowered in all the plots visually. The days taken from the date of sowing to the physiological maturity were recorded from each net plot carefully by visual observation when plant leaves became completely yellow, grains become hard and turn to golden-yellow colour. The days to maturity in each plot were counted from the date of nursery raising and expressed as days to physiological maturity.
 
Leaf area
 
Leaf area per hill was calculated by the dry weight method. Leaf areas of two leaves were obtained by the graphical method and such leaves along with the remaining leaves were dried separately in a hot air oven at 80°C for 72 hrs. The dry weight of two leaves and the rest of the leaves were recorded and the leaf area was calculated by using the following formula.
 
Leaf area = (a x w)/b + a cm2 hill -1
 
Where,
a = Leaf area (cm2) of 2 leaves.
b = Dry weight (mg) of 2 leaves.
w = Dry weight (mg) of the rest of the leaves.
 
Relative water content (%)
 
The relative water content was estimated by the method of Barrs and Weatherly (1962).
 
 

The protein content was estimated by the method of Bradford (1976) and chlorophyll content was estimated by the acetone method given by Arnon (1949).

Harvest index (%)
 
The harvest Index was calculated as per the below given formula given by Donald (1962).
 
 
 
Statistical analysis
 
The experimental data were statistically analyzed by using the Co-Stat Software of analysis of variance (ANOVA) for split-plot design (Gomez and Gomez, 1984). The test of significance was carried out at a 5% level of significance by referring to the ‘F’ table values.

RESULTS AND DISCUSSION

Plant growth and developmental studies
 
The observations on growth attributes viz., plant height (cm), tillers per hill, leaf area per hill, days to 50% flowering and days to physiological maturity were recorded at the heading stage (80 DAT/DAS) and presented in Table 1. The plant height ranged from 88 cm in CE4 [ZT rice-ZT wheat] to 78.7 cm in CE1 [CT rice-CT wheat]. Tillers per hill was maximum in CE4 [ZT rice-ZT wheat] (14.9) and minimum in CE1 [CT rice-CT wheat] (9.4). Similarly, Leaf area was highest at 1088.3 cm2 hill-1 in CE4 [ZT rice-ZT wheat] as compared to 856.5 cm2 hill-1 in CE1 [CT rice–CT wheat]. The data on growth parameters showed more variations among crop establishment methods. The different crop establishment methods found a significant effect on growth parameters viz., plant height, tillers hill-1 and leaf area in two years pooled data at the heading stage of crop growth. The maximum values were recorded in zero till DSR (CE4) over conventional till puddled transplanted rice (CE1) followed by CTDSR (CE3). The days to 50% flowering and days to physiological maturity were reduced under zero-till DSR (CE4) (69.3 and 112.8 days) and was maximum (77.9 and 118.4 days) in conventional till puddled transplanted rice (CE1). Various nutrient management practices had a significant influence on growth attributes viz., plant height, number of tillers hill-1, leaf area, days to 50% anthesis and days to physiological maturity in pooled data of both years. At the heading stage, significantly higher growth attributes were recorded by nutrient application based on RWCM- SSNM approach (N3) compared to farmer’s practice (N1) followed by recommended fertilizer dose (N2) treatment. Interaction failed to reach the level of significance except for the leaf area. Similar results were reported earlier by researchers (Hobbs et al., 2002; Yadav et al., 2014 and Singh et al., 2018).

Table 1: Effect of crop establishment methods and nutrient management on plant height, tillers hill-1, leaf area hill-1, days to 50% flowering and days to physiological maturity (Pooled data).


 
Physiological and biochemical studies
 
The applicable data (Table 2) related to physiological and biochemical parameters viz., relative water content, total chlorophyll content and protein content as influenced by crop establishment methods and nutrient management practices were studied. The same were recorded at 80 DAS/DAT during both years of study. The first fully mature and expanded leaves were used for the analysis. The relative water content, chlorophyll content and protein content of leaves was recorded significantly highest in treatment CE4 (ZT rice - ZT wheat) (96.84%, 1.61 mg g-1 FW and 6.31 mg g-1 FW) due to absorption of moisture in the soil by crop residues followed by CE3 (96.03%, 1.51 mg g-1 FW and 5.92 mg g-1 FW)and the least was recorded in CE1(93.73%, 1.31 mg g-1 FW and 5.11 mg g-1 FW). The pooled data of two years for crop establishment methods differed significantly at 80 DAS/DAT. Under sub plot i.e. nutrient management practices, RWC and total chlorophyll content did not differ significantly. The maximum values were recorded in N3 (SSNM-RWCM) followed by N2 (Recommended fertilizer dose) and the minimum was observed in N1 (Farmers practice). Although the data obtained for protein content was found significant with 5.80 mg g-1 FW in N3 (SSNM-RWCM) and 5.65 mg g-1 FW in N1 (Farmers practice). The treatment combination of CE4 with N3 has higher values due to the optimum use of resources and efficient use of nutrients indirectly increasing the yield of the crop. Similar results were also found in Bhattacharya and Singh (1992).

Table 2: Effect of crop establishment methods and nutrient management on relative water content (%), total chlorophyll content and protein content of rice (Pooled data).


 
Yield components and yield
 
The relevant data (Table 3 and 4) related to yield attributes viz., number of panicles, number of spikelets panicle-1, test weight, number of filled grains panicle-1, panicle length, fertility percentage, grain yield, straw yield, biological yield and harvest index as influenced by crop establishment methods and nutrient management practices were studied. The maximum yield was recorded in CE4 followed by CE3 and the least was recorded in CE1 and among the subplots highest in N3 (SSNM-RWCM) followed by N2 (Recommended fertilizer dose) and least in treatment N1 (Farmers practice). The enhanced values in yield components could be due to increasing leaf area leading to higher photosynthesis and accumulation of more assimilates which led to increased grains per panicle and fertility percentage (Balasubramanian and Hill, 2002). The number of panicles per hill, number of filled grains panicle-1 and fertility percentage showed significant differences in CE methods and nutrient management practices in the pooled data of two years. The maximum number of panicles per hill,number of filled grains panicle-1 and highest fertility percentage was recorded in CE4 followed by CE3 and the least was recorded in CE1 and among the subplots highest in N3 (SSNM-RWCM) followed by N2 (Recommended fertilizer dose) and least in treatment N1 (Farmers practice).Panicle length,numbers of spikelets panicle-1 and test weight (g) did not differ significantly among treatments of CE methods and nutrient management practices in the pooled data of two years although the maximum number of spikelets per panicle and test weight was recorded in treatment CE4 (ZT rice - ZT wheat) and N3 (SSNM-RWCM) respectively.

Table 3: Effect of crop establishment methods and nutrient management on panicles hill-1, spikelet’s panicle-1, filled grains panicle-1, test weight (g), fertility percentage and panicle length of rice (Pooled data).



Table 4: Effect of crop establishment methods and nutrient management on grain yield (kg plot-1 and q ha-1), straw yield (q ha-1), biological yield (q ha-1) and harvest index (%) of rice (Pooled data).



The highest grain yield (kg plot-1 and q ha-1) showed significant differences in CE methods and nutrient management practices in the pooled data of two years. The highest grain yield (13.45 kg plot-1 and 49.21q ha-1) was recorded in CE4 followed by CE3 and the least was recorded in CE1 (11.21 kg plot-1 and 41.82q ha-1) and among the subplots highest in N3 (SSNM-RWCM) (12.61 kg plot-1 and 47.02 q ha-1) followed by N2 (Recommended fertilizer dose) and least in treatment N1 (Farmers practice) (11.98 kg plot-1 and 44.71 q ha-1). The straw yield (q ha-1) and biological yield (q ha-1) also differed significantly in CE methods and nutrient management practices in both the years of study. The highest straw yield and biological yield was recorded in CE4 followed by CE3 and the least was recorded in CE1 and among the subplots highest in N3 (SSNM-RWCM) followed by N2 (Recommended fertilizer dose) and least in treatment N1 (Farmers practice). The harvest index did not differ significantly among treatments of CE methods and nutrient management practices in both the year of study, although the highest harvest index was recorded in treatment CE4 (ZT rice - ZT wheat) and N3 (SSNM-RWCM) respectively.

CONCLUSION

Crop establishment methods and nutrient management practices treatments were continuously practiced in the same plots for the last nine years as part long-term study which resulted in substantive changes in the research plots. It is well understood that Zero tillage improves crop growth, water use efficiency and optimum nutrient use in rice-wheat cropping systems. Zero tillage with residue retention provides a healthy soil environment by reducing soil compaction and allowing water and roots to move to deeper soil layers. In our experiment it was found that the ZT rice-ZT wheat (CE4) crop establishment method recorded highest growth, physiological, biochemical, yield attributes and grain yield of rice due to efficient crop resource use over CT rice-CT wheat (CE1) and in respect of nutrient management practices as per SSNM-RWCM recommendation (N3) enhanced growth, physiological, biochemical, yield attributes and grain yield of rice. It can be concluded that the ZT rice-ZT wheat (CE4) crop establishment method with SSNM-RWCM recommendation (N3) should be followed to achieve better growth, physiology, higher grain yield and harvest index in rice. However, further research needs to be carried out on the impact of different tillage practices under variable components of the rice-wheat cropping system.

ACKNOWLEDGEMENT

I sincerely acknowledge the University Grants Commission for providing me the National fellowship during the course of my Ph. D research program.
 

CONFLICT OF INTEREST

The authors declare that they have no conflicts of interest.

REFERENCES


  1. Arnon, D. (1949). Copper enzymes isolated chloroplasts, polyphenol oxidase in beet (Beta vulgaris L.). Plant Physiology. 24: 1-15.

  2. Balasubramanian, V. and Hill, J.E. (2002). Direct Seeding of Rice in Asia: Emerging Issues and Strategic Research Needs for the 21st century, In: [Pandey et al., (Eds.)], Direct Seeding: Research Strategies and Opportunities, Proceedings of International Workshop on Direct Seeding in Asian Rice System, January 25-28, Bangkok, Thailand, International Rice Research Institute, Los Banos, Phillippines, pp. 15-42.

  3. Barrs, H.D. and Weatherley, P.E. (1962). Procedure of estimation of Relative water content in leaves on a percentage basis. Australian Journal of Biological Sciences. 15(3): 413-428.

  4. Bhattacharya, H.C. and Singh, K.N. (1992). Response of direct- seeded rice (Oryza sativa L.) to the level and time of nitrogen application. Indian Journal of Agricultural Sciences.  37: 681-685. 

  5. Bhushan, L., Ladha, J.K, Gupta, R.K., Singh, S., Padre, A.T. and Saharaswat, Y.S. (2007). Saving water and labour in a rice-wheat system with no-tillage and direct seeding technologies. Agronomy Journal. 99: 1288-1296. 

  6. Boparai, B.S., Singh, Y. and Sharma, B.D. (1992). Effect of green manuring with sesbania aculeate on physical properties of soil and on the growth of wheat in rice-wheat cropping systems in a semi-arid region of India. Arid Soil Research and Rehabilitation. 6: 135-143. 

  7. Bradford, M.M. (1976). A rapid and sensitive method for the quantitation of microgram quantities of protein utilizing the principle of protein-dye binding. Analytical Biochemistry. 72: 248- 254.

  8. Chandna, P., Ladha J.K., Singh, U.P., Punia M, Gupta, R. and Sidhu, B.S. (2010). Using remote sensing technologies to enhance resource conservation and agricultural productivity in underutilized lands of South Asia. Applied Geography. 32: 757-765. 

  9. Donald, C.M. (1996). In search of yield. Journal of Australia Institute of Agricultural Sciences. 28: 171-178.

  10. Gomez, K.A. and Gomez, A.A. (1984). Statistical Procedures for Agricultural Research. 2nd Edition: A Wiley Inter Science Publication. New York, USA. 

  11. Gupta, R.K. and Sayre, K. (2007). Conservation agriculture in South Asia. Journal of Agricultural Sciences. 145: 207-214. 

  12. Gupta, R.K. and Seth, A. (2007). A review of resource conserving technologies for sustainable management of the rice- wheat cropping system of the indo-gangetic plains. Crop Protection. 26: 436-447. 

  13. Hobbs, P.R. and Morris, M. (1996). Meeting South Asia‘s future food requirements from rice-wheat cropping systems: Priority issues facing researchers in the Post-Green Revolution era. NRG Paper. 96-101.

  14. Hobbs, P.R., Singh, Y., Giri, G.S., Lauren, J.G. and Duxbury, J.M. (2002). Direct Seeding and Reduced-Tillage Options in the Rice-wheat Systems of the Indo-Gangetic Plains of South Asia. In: [Pandey et al. (Eds.)] Direct seeding: Research and Strategies and opportunities, Proceedings of the International Workshop on Direct Seeding in Asian Rice Systems: Strategic Research Issues and Opportunities. January 25-28, Bangkok, Thailand. 201-205. 

  15. Jat, M.L., Gathala, M, Sharma, S.K., Ladha, J.K., Gupta, R.K. and Saharawat, S. (2006). Productivity and profitability of rice- wheat system with double no-till practice, In: Proceedings of the 2nd International Rice Congress, October, New Delhi, India. 88: 9-13. 

  16. Jat, R.K., Sapkota, T.B., Singh, R.G., Jat, M.L., Kumar, M. and Gupta, R.K. (2014). Seven years of conservation agriculture in a rice-wheat rotation of Eastern gangetic plains of South Asia: Yield trends and economic profitability. Field Crops Research. 164: 199-210. 

  17. Kumar, V., Bellinder, R.R., Gupta, R.K., Malik, R.K., Brainard, D.C. (2008). Role of herbicide-resistant rice in promoting resource conservation technologies in rice-wheat cropping  systems of India: A review. Crop Protection. 27: 290-301.

  18. Sharma, P.K., Ladha, J.K. and Bhushan, L. (2003). Soil Physical Effects of Puddling in Rice-wheat Cropping Systems. In: [Ladha et al., (Eds.)], Improving the productivity and sustainability of rice-wheat systems: Issues and Impacts, ASA Specific Publication 65. American Society of Agronomy,  Crop Science Society of America and Soil Science Society of America, Madison, West Indies. 97-113.  

  19. Sharma, S.N., Bohra, J.S., Singh, P.K. and Srivastava, R.K. (2002). Effect of tillage and mechanization on production potential of the rice-wheat cropping system. Indian Journal of Agronomy. 47: 305-310.  

  20. Singh, H., Singh, U.P., Singh, S.P. and Singh, Y. (2018). Effect of crop establishment and nutrient management on productivity and profitability of rice under rice-wheat system. International Journal of Chemical Studies. 6(3): 165-170.

  21. Singh, U.P., Singh, Y., Kumar, V. and Ladha, J.K. (2009). Evaluation and Promotion of Resource Conserving Tillage and Crop Establishment Technique in the Rice-wheat System of Eastern India. In: [Ladha et al., (Eds.)], Integrated Crop and Resource Management in the Rice-wheat System of South Asia. International Rice Research Institute, Los Banos, Philippines. pp-151-176.

  22. Yadav, A., Dharam-Bir, Gill, G., Malik, R.K., Kumar, V., Singh, S., Jat, R.K., Kumar, P., Kamboj, B. R., Chauhan, B.S. (2014).  Potentials of Direct Seeded Rice with Efficient Weed Management to Sustain and Improve Productivity and Profitability of Rice-wheat Cropping System in India. In: Proceedings of ISWS Biennial Conference on Emerging Challenges in Weed Management, 15-17 February, 2014, Jabalpur, India, pp 6 (L-6).
Reviewed By

Download Article
In this Article
    Contact us
    Follow us

    Editorial Board

    View all (0)