Growth attributes
Statistical analysis of the data indicated that integrated nutrient management showed significant influence on plant height (Table 1). The results indicated that application of 50% RDF + 2 t VC ha
-1 + Bio NP (T
6) recorded significantly the tallest plant at all the growth stages during both year as well as on pooled basis. As compared to other treatments, the treatment T
6 produced the tallest plant of 28.25, 49.00 and 58.47 cm in the year 2017-18, 24.93, 49.93 and 53.69 cm in the year 2018-19 as well as on pooled basis 26.59, 49.47 and 56.08 cm at 30, 60 DAS and at harvest, respectively and it was remained at par with 50 % RDF + 5 t FYM ha
-1 + Bio NP (T
5) but, plant height of chickpea at 30 DAS did not exercise any significant influence during 2017-18 and 2018-19. Increase in the plant height of chickpea could also be attributed to the higher production of plant growth promoting factors by beneficial microbial inoculants present in organic manures, which might have resulted in more intense root system and increase in shoot growth by enhanced nutrient uptake. Similar results were recorded by
Rameshwar et al., (2017) in chickpea-okra cropping system. However, the shortest plant (44.90 cm) was observed in 50 % RDF + Bio NP (T
2) at harvest (Table 1). INM treatments did not influence the number of branches plant
-1 at harvest, the root length at 30DAS, 60 DAS and at harvest, and fresh and dry weight of root nodules at 45 DAS of chickpea during both years as well as in pooled basis.
Significantly the highest dry matter production of the chickpea (1.81, 19.63 and 43.17 g plant
-1 in the year 2017-18, 1.91, 18.65 and 40.36 g plant
-1 in the year 2018-19 as well as on pooled basis 1.86, 19.14 and 41.76 g plant
-1) was recorded with the treatment combination of 50% RDF + 2t VC ha
-1 + Bio NP (T
6) as compared to other treatments at 30 DAS, 60 DAS and at harvest, respectively (Table 2). This might be due to the fact that more nutrient availability under INM treatments resulted into increased conversion of carbohydrates into protein which in turn elaborated into protoplasm and cell wall material increased the size of the cell, which expressed morphologically in terms of plant height, number of branches plant
-1 ultimately dry matter accumulation, Cellulose is a highly persistent composition material, which requires longer time for decomposition. Thus, FYM and VC may have not fully utilized by chickpea crop during the first crop season and notably benefited the succeeding forage sorghum crop. Similar line of results were also reported by
Patil et al., (2008), Singh et al., (2012), Tyagi et al., (2014), Sohu et al., (2015) and
Sindhi et al., (2016).
The close examination of data given in Table 3 revealed that application of 50% RDF + 2t VC ha
-1 + Bio NP (T
6) recorded the highest dry root biomass of chickpea (0.484, 1.067 and 1.443 g plant
-1 in the year 2017-18, 0.439, 1.024 and 1.342 g plant
-1 in the year 2018-19 as well as on pooled basis 0.462, 1.046 and 1.392 g plant
-1) as compared to other treatments at 30, 60 DAS and at harvest, respectively. This result indicated that though the root length was found non-significant, but due to numerically higher root length contributes to increase the root dry biomass. The results are in close conformity with the findings of
Tyagi et al., (2014).
Yield and yield attributes
The pooled data the of number of pods plant
-1, seed yield, stover yield, seed index and harvest index of chickpea recorded at harvest was influenced by the different INM treatments (Table 4). Application of 50% RDF + 2 t VC ha
-1 + Bio NP (T
6) recorded the highest number of pods plant
-1 (81.29, 74.88 and 78.09), seed yield (2803, 2538 and 2671 kg ha
-1) and stover yield (4060, 3699 and 3880 kg ha
-1) of chickpea than other treatments in the year 2017-18, 2018-19 and pooled analysis, respectively. The response of different treatments on those traits was observed in order of T
6>T
1>T
5>T
4>T
3>T
2. This might be due to the fact that integrated use of organic, inorganic and bio fertilizer resulted in better growth attributes of the plants (
viz., plant height, No. of branches plant
-1, dry matter production and dry root biomass). The increased availability of nutrients due to use of INM was observed by
Tyagi et al., (2014) which enhanced greater translocation of photosynthates from the source to sink site that resulted in to higher yield contributing characteristics like number of pods plant
-1 and seed index and ultimately increased the seed yield as compared to other treatments. Results further indicated that application of 50% RDF + Bio NP (T
2) and 50% RDF + 5 t FYM ha
-1 (T
3) recorded lower seed yield might be due to reduction of 50% recommended dose of fertilizer in both the treatments and this deduction of 50% RDF was not fulfilled by either Bio NP (
Rhizobium + PSB) or 5 t FYM ha
-1 in respective treatment. The favourable effect of integration of organic manures, inorganic fertilizers and bio fertilizer on yield of chickpea was also recorded by
Tolanur and Badanur (2003),
Sindhi et al., (2016), Shivran et al., (2017), Singh et al., (2017) and
Kemal et al., (2018).
Stover yield (kg ha
-1) was also recorded significantly the highest under application of 50% RDF + 2 t VC ha
-1 + Bio NP (T
6). This might be due to benefits accruing from the integrated use of organic with inorganic fertilizer resulting in better supply of nutrients along with congenial environment leading to better root activity and higher nutrient absorption, which resulted in better plant growth like plant height, dry matter production and dry root biomass contributes to increase the stover yield. Similar results were also recorded by
Lakpale et al., (2003) in chickpea,
Singh et al., (2010) in lentil,
Tyagi et al., (2014) in green gram and
Rameshwar et al., (2017) in chickpea-okra cropping system.
It is clear from the data (Table 4) that harvest index and seed index were remained unchanged or found non-significant due to integrated nutrient management treatments in the year 2017-18, 2018-19 as well as pooled basis. However, effect of integrated nutrient management in chickpea on the harvest index and seed index was found numerically higher under application of 50% RDF + 2 t VC ha
-1 + Bio NP (T
6). Similar finding were also recorded by
Elamin and Madhavi (2015),
Sindhi et al., (2016), Shivran et al., (2017) and
Kemal et al., (2018).