2023, Vol. 8, Special Issue 5

The study was initiated to evaluate the growth attributes of the chickpea (gram) crop under the Jatropha curcas based Agroforestry system all over the years 2019–20 and 2020–21 in an 8–9 year old Jatropha curcas plantation, planted at a distance of 3x3m. Correlation coefficient of Cyprus rotundus (0.934) and Medicago denticulata (0.971) had highest positive correlation with the weed dry weight during 2019-20 and 2020-21, respectively. The Cynodon dactylon had lowest correlation coefficient with the weed dry weight (0.886) during first year (2019-20) and Cyprus rotundus (0.914) was found during (2020-21). Regression coefficient of Medicago denticulata contributed to the greater extent for weed dry weight production with increase of one plant, the increase in weed dry weight could be predicted by 1.344 q ha^-1 followed by Cyprus rotundus 0.936 q ha-1, Cynodon dactylon 0.439 q ha^-1 and Vicia sativa 0.111 q ha^-1 during first year (2019-20) and Cyprus rotundus 0.525 q ha^-1 followed by Vicia sativa 0.378 q ha-1, Cynodon dactylon 0.370 q ha^-1 and Medicago denticulata 0.271 q ha^-1 during second year (2020-21). Correlation coefficient Cyprus rotundus had highest negative association with Chickpea seed yield (-0.816 and -0.938 q ha^-1) during both the years. Regression coefficient data revealed that the reduction in yield could be predicted to extent of 2.026 q ha-1 with increase of one plant of Cyprus rotundus. The greater reduction in yield can also be predicted due to density of Cynodon dactylon, Medicago denticulate, and Vicia sativa. The reduction could be predicted by 0.975, 0.619 and 0.579 q ha^-1 respectively during first year (2019-20). However, during second year (2020-21) Cyprus rotundus reduced highest extent of chickpea seed yield (2.803 q ha^-1) with increase of one plant followed by Vicia sativa, Cynodon dactylon, and Medicago denticulata. The reduction could be predicted by 1.59, 1.57 and 1.046 q ha^-1 with increase of one plant of weed species, respectively. The greater reduction in chickpea seed yield can also be predicted due to density of Cynodon dactylon, Vicia sativa and Medicago denticulate weed species under gram – Jatropha based Agroforestry system.