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Research Article

Legume Research, volume 44 issue 5 (may 2021) : 562-567

Effect of Integrated Nutrient Management on Seed Vigour Potential of Fenugreek (Trigonella foenum-graecum L.) during Ambient Storage

Ovais Hamid Peerzada1,*, V.S. Mor1, O.S. Dahiya1
1Department of Seed Science and Technology, CCS Haryana Agriculture University, Hisar-125 004, Haryana, India.

  • Submitted30-01-2019|

  • Accepted08-11-2019|

  • First Online 17-02-2020|

  • doi 10.18805/LR-4124

Cite article:- Peerzada Hamid Ovais, Mor V.S., Dahiya O.S. (2020). Effect of Integrated Nutrient Management on Seed Vigour Potential of Fenugreek (Trigonella foenum-graecum L.) during Ambient Storage . Legume Research. 44(5): 562-567. doi: 10.18805/LR-4124.

ABSTRACT

The experiment was conducted at Department of Seed Science & Technology CCS, Haryana Agriculture University, Hisar, Haryana from 2013-15 and comprised of seventeen treatment combinations of manures (viz., FYM and Vermicompost), bio-fertilizers (viz., Rhizobium & PSB) and fertilizers. The freshly harvested fenugreek seeds of all the seventeen treatment plot combinations were stored in plastic containers under ambient conditions up to a period of eighteen months. Seed quality was assessed at a regular interval of six months. A significant decline in seed quality was observed in all the nutrient combinations as the period of ageing increased. It was observed that the treatment combination of Rhizobium and PSB along with 75% Recommended Dose of Nitrogen (RDN) recorded significantly higher germination % (87.33%), seedling length (24.77 cm), dry weight (7.5 mg), vigour index-I (2163) and vigour index-II (657) followed by PSB with 100% RDN and Rhizobium with 100% RDN after eighteen months of ambient storage as compared to control. The electrical conductivity (333 µS cm-1g-1) was also recorded minimum in the treatment Rhizobium and PSB along with 75% RDN followed by PSB with 100% RDN and Rhizobium with 100% RDN after the period of ambient storage while the maximum was recorded in control. The study highlighted that the slightly reduced dose of inorganic nitrogen was best when applied in combination with bio-fertilizer (Rhizobium+PSB) for maximizing the storage potential of fenugreek seed as compared to the rest of treatments. 

INTRODUCTION

Fenugreek (Trigonella foenum-graecum L.) belongs to the family Fabaceae and is an important seed spice crop. In India, it is mainly grown in Rajasthan, Gujarat, Madhya Pradesh, Maharashtra and Haryana. The seeds of fenugreek are used as a condiment and seasoning agent for garnishing and flavouring dishes. Being a leguminous crop, the root nodules enrich the soil with the fixing of atmospheric nitrogen.
 
India has made a spectacular breakthrough in production and consumption of fertilizers during the last four decades. But use of non-renewable form of energy, i.e. chemical fertilizers will be quite a limiting factor of agricultural production in future. Because of escalating energy cost, chemical fertilizers are not available at affordable price to the farmers. Moreover, the imbalance and continuous use of chemical fertilizers has adverse effect on soil physical, chemical and biological properties thereby affecting the sustainability of crop production, besides causing environmental pollution (Virmani, 1994).
 
Chemical fertilizers, although, are sufficient for nutritional requirement of crop, but their continuous usage leads to nutrient exhaustion which is a matter of concern for sustainability of agriculture and therefore it is essential to reduce dependency on chemical fertilizers and promote the use of organics but organics contain less nutrients and hence does not result in better yields. (Subba Rao and Tilak, 1977). The organic matter being the store house of nutrients, the combined application of organic and inorganic fertilizer can increase the yield, improve the fertility status of soil, improve the input-use efficiency by the crop and can certainly cut down the expenditure on costly fertilizers (Lakshminarayana and Sharma, 2015).
 
The seed is an important component of agricultural production and industry in India. The quality seed plays important role in agricultural production as well as in national economy. Therefore, the good quality seed is necessary to enhance production and productivity. Availability of viable and vigorous seed at the planting time is important for achieving targets of agricultural production because good quality seed acts as a catalyst for realizing the full potential of other inputs. Since the total cultivable area is decreasing and population is growing, thus improvement in agricultural productivity is the only option. Use of quality seeds increased productivity of crop by 15-20% (Sidhwani, 1991).
 
Seed possesses maximum viability and vigour at physiological maturity Meena et al., (1994) thereafter, seeds show gradual ageing and decline in viability and vigour. Seed deterioration leads to a reduction in seed quality, performance and stand establishment which is a major problem in agriculture production (Chiristiansen and Rowland, 1981). Temperature and relative humidity are the main factors influencing seed deterioration and viability loss in storage Barton (1964), James (1964) and Roberts (1972). Lower temperature and humidity result in delayed seed deteriorative process and ageing thereby leads to extended viability period. Seed ageing is generally marked by reduction in vigour Trawatha et al., 1995; Saxon et al., 1987), viability, rate and capacity of germination (Arefi and Abedi, 2003), increased solute leakage (Basra et al., 2003) and susceptibility to stresses and reduced tolerance for storage under adverse conditions (Duffs and Slaughter, 1980).
 
Seed ageing causes gradual decline in all vital cellular components which leads to progressive loss of viability. Lipid auto-oxidation, which involve production of free radicals has also been suggested to be one of the causes of seed ageing (Willson and McDonald, 1986).Therefore, effective management of viability and vigour of seed is important to tackle these problems and to avoid any serious threat to agriculture.

MATERIALS AND METHODS

The research experiment was conducted during 2013-15 at the laboratories of Department of Seed Science and Technology CCS Haryana Agriculture University, Hisar, Haryana. The freshly harvested seeds of the fenugreek variety “Hisar Suvarna” were stored in plastic containers under ambient conditions for a period of eighteen months. The seeds of each treatment plot were sampled at an interval of six months and evaluated for seed quality parameters in a completely randomized design (CRD). The biofertilizers Rhizobium and Phosphorous Solubilizing Bacteria (PSB) were used as seed treatment @10 ml/10 kg of seed while Farm Yard Manure (FYM) and vermicompost were used @ 20 t/ha and 5 t/ha respectively. The recommended dose of fertilizers (RDF- 25 kg N + 40 kg P2O5 + 0 kg K2O per ha) was applied to the plots as per the treatment details in the form of urea, diammonium phosphate and muriate of potash.  The samples were analyzed for key characters viz. germination %, seedling length, dry weight, vigour index-I, vigour index-II and electrical conductivity. The statistical analysis was carried out as per the methods suggested by (Panse and Sukhatme, 1985).
 
List of treatment combinations:
T0     :   Control     
T1     :   Rhizobium + 20 t/ha FYM
T2    :   Rhizobium + 15 t/ha FYM
T3     :   Rhizobium + 5 t/ha Vermicompost
T4    :   Rhizobium + 3.75 t/ha Vermicompost
T5     :   Rhizobium + 100% RDN
T6     :   Rhizobium + 75% RDN
T7     :   PSB + 20 t/ha FYM
T8       :   PSB +15 t/ha FYM
T9     :   PSB + 5 t/ha Vermicompost
T10    :   PSB + 3.75 t/ha Vermicompost
T11    :   PSB + 100% RDN
T12    :   PSB + 75% RDN          
T13   :   Rhizobium + PSB + 15 t/ha FYM
T14   :   Rhizobium + PSB + 3.75 t/ha Vermicompost
T15   :   Rhizobium + PSB + 75% RDN
T16    :   NPK (25:40:0 kg/ha)
 
The following parameters were tested on the seed obtained from the above treatments after adopting standard seed production and post-production practices.
 
Germination (%)
 
One hundred seeds obtained from each treatment plot in three replicates were placed in between sufficient moistened rolled towel papers (BP) and kept at 20oC in seed germinator. The first count was taken on 5th day and final count on 14th day and only normal seedlings and hard seeds were considered for percent germination according to the rules of International Seed Testing Association. ISTA (2011).
 
Seedling length (cm)
 
Seedling length was measured on 10 randomly selected normal seedlings taken from three replications of standard germination test and average of 10 seedlings was recorded in centimeter for final calculation.
 
Dry weight (mg)
 
Seedling dry weight was assessed after the final count in the standard germination test (14 days). The 10 seedlings of each treatment replicated thrice were taken. Seedlings were dried in a hot air oven for 24 h at 80±1°C. The dried seedlings of each replication were weighed and average seedling dry weight of each treatment was calculated.
 
Vigour index I and II
 
Seedling vigour indices were calculated according to the method suggested by (Abdul-Baki and Anderson, 1973).
 
I. Vigour index-I (on seedling length basis):
Vigour index–I = Standard germination (%) × Average seedling length (cm)
 
II. Vigour index–II (on seedling dry weight basis):
Vigour index–II = Standard germination (%) × Average seedling dry weight (g)
 
Electrical conductivity test (μS cm-1g-1)
 
To measure the electrical conductivity, 50 normal and uninjured seeds in three replications were soaked in 75 ml deionized water in 100 ml beakers. Seeds were immersed completely in water and beakers were covered with foil. Thereafter, these samples were kept at 25°C for 24 h. The electrical conductivity of the seed leachates was measured using a direct reading conductivity meter. The conductivity was expressed in μS/cm/ gram.

RESULTS AND DISCUSSION

Deterioration of seed quality and longevity during storage are well known. However, the extent of losses is governed by a number of internal and external factors. Relative humidity and temperature are the major factors which are known to influence the seed quality during storage. Seed moisture content and temperature also influences storability through its influence on growth, activity and reproduction of storage molds and insects (Delouche, 1968).     
 
The present investigation is an effort made to determine the effect of organic manures, inorganic fertilizers and biofertilizers on seed quality of fenugreek during natural ageing at ambient storage. This effort will provide an understanding of the role of fertilizers applied during crop growth, on seed quality and its storability.
 
In the present study, standard germination percentage showed a significant decline after six, twelve and eighteen months of ambient storage. The maximum decline was recorded after eighteen months of natural storage in all the treatment combinations. However, the maximum germination percentage (87.33) after eighteen months of ambient storage of fenugreek seed was observed in the treatment combination of (T15) Rhizobium + PSB + 75% RDN followed by (T11) PSB + 100% RDN (82.33) while minimum (61.67) was observed in control (T0) where no nutrients were applied (Table 1). The higher germination percentage in T15 during the period of natural storage might be because of the better accumulation of food reserves like protein and carbohydrates due to the inoculation of biofertilizers along with nitrogen at the time of seed development. There was decrease in germination percent in all the nutrient combinations because of natural ageing irrespective of treatment leading to seed deterioration and loss in vigour. These results are in accordance with that of Amjad and Arjun (2002), Deepak and Yadav (2014), Singh et al., (2015) and Khan et al., (2013).
 

Table 1: Effect of integrated nutrient management on standard germination (%) of fenugreek seed stored at ambient condition.


 
Seedling length and dry weight of all the treatment combinations also showed a significant decrease with the advancement of ageing period and the highest decline in both the characters was observed after eighteen months of natural storage (Table 2). The highest seedling length (24.77 cm) after eighteen months of ambient storage was recorded with the application of (T15) Rhizobium + PSB + 75% RDN followed by the application of (T11) PSB + 100% RDN (23.77 cm) while the shortest was recorded in (T0) control (13.53cm). The perusal of data from Table 2 showed that the highest dry weight after eighteen months of natural ageing was also observed in the treatment combination of Rhizobium + PSB + 75% RDN (7.5) followed by the treatment (T11) PSB + 100% RDN (7.2) and the lowest was observed in (T0) control (3.7). Among all the treatments T15 and T11 showed better seedling length and dry weight throughout storage This might be due to the accumulation of higher quantities of seed constituents like carbohydrates in the seed due to the nutrition of fenugreek plants by the co-inoculation of Rhizobium and PSB along with inorganic nitrogen and conversion of macromolecules into micromolecules due to release of certain enzymes (Yadav and Khurana, 2003).
 

Table 2: Effect of integrated nutrient management on seedling length (cm) and Seedling Dry Weight (mg) of fenugreek seed stored at ambient condition.


 
Reduction in seedling length and seedling dry weight during storage may be due to decrease in mobilization of reserve substances during germination of the stored seeds (Dhakal and Pandey, 2001). Ageing led to decrease in seedling length and seedling dry weight which is confirmed with the earlier findings of Kumar and Verma (2008), Verma et al., (2003), Singh et al., (2003) and Nagarajan et al., (2004).
 
Vigour index -I and Vigour index -II declined significantly with the increase in period of ageing in all the seventeen treatment combinations of fenugreek seed (Table 3). Among treatments, the vigour index-I and II after the eighteen months of natural ageing was maximum (2163, 657) in (T15) Rhizobium + PSB + 75% RDN followed by (T11) PSB + 100% RDN (2432, 596) and minimum (861, 233) in (T0) control respectively. Similar results in fenugreek were reported by Kumar and Verma (2008) and Singh et al., (2015).
 

Table 3: Effect of integrated nutrient management on Vigour Index-I and Vigour Index-II of fenugreek seed stored at ambient condition.


 
 
The change of electrical conductivity during seed soaking is commonly used as an indicator for testing the integrity of plasma membrane (Bewley and Black, 1994). Electrical conductivity (µS/cm/g) of seed leachates increased significantly after ageing in all the treatment combinations of fenugreek (Fig 1). The maximum (572 µS/cm/g) electrical conductivity after eighteen months of ambient storage was recorded in control (T0) while minimum (333 µS/cm/g) was recorded in the treatment (T11) PSB + 100% RDN followed by T15, Rhizobium + PSB + 75% RDN (339). The better performance in T11 and T15 may be due to the inoculation of biofertilizers along with the inorganic nitrogen which may have increased the cell membrane stability and decreased the leakage of solutes from the seeds because of availability of more nutrients for the growth of plant and seed development which ultimately lead to intact seed coat (Namvar et al., 2013). The increase in electrical conductivity during the period of ageing is because of the enhancement of leakage due to alterations in the membranes of aged seeds which led to electrolyte leakage. The loss of membrane integrity due to damage of phospholipids leads to increased membrane permeability and release of electrolytes, aminoacids and enzymes from cells (Zamani et al., 2010). Results were in conformity with the earlier findings of Kumari et al. (2014), Kumar and Verma (2008) and Goel et al., (2003).
 

Fig 1: Effect of integrated nutrient management on electrical conductivity (µS cm-1g-1) of fenugreek seed stored at ambient condition.


 
From the above study it was concluded that the treatment combination of Rhizobium and PSB along with 75% Recommended Dose of Nitrogen (RDN) performed best as compared to other treatments in terms of seed quality parameters viz., germination%, seedling length, dry weight, vigour index-I and II and electrical conductivity followed by PSB with 100% RDN and rhizobium with 100% RDN after eighteen months of ambient storage. The study highlighted that the slightly reduced dose of inorganic nitrogen was best when applied in combination with bio-fertilizer (Rhizobium + PSB) for maximizing the storage potential of fenugreek seed as compared to the rest of treatments.

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