Effect of integrated weed management and balanced fertilization on productivity of coriander (Coriandrum sativum L.)
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Date
2005
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MPUAT, Udaipur
Abstract
A field Experiment was conducted during Rabi seasons of 2002-03 and 2003-04 at Instructional Farm, Department of Agronomy, Rajasthan College of Agriculture, Udaipur. The treatments comprising eleven weed management practices [weedy check, one hand weeding (HW) at 30 DAS, two HW at 30 and 45 DAS, pendimethalin 1.0 kg ha-1 PE, oxyfluorfen 0.25 kg ha-1 PE, metribuzin 0.30 kg ha-1 PE, oxadiargyl 75.0 g ha-1 PE, pendimethalin 1.0 kg ha-1 PE + HW at 45 DAS, oxyfluorfen 0.25 kg ha-1 PE + HW at 45 DAS, metribuzin 0.30 kg ha-1 PE + HW at 45 DAS and oxadiargyl 75.0 g ha-1 PE + HW at 45 DAS) and three balanced fertilization doses (N60 + P30, N60 + P30+ K30 and N60 + P30+ K30 + S30 kg ha-1) assigned to main and subplots were replicate thrice in split plot design. Coriander variety ‘CS-6’ was used as a test crop.
The results show that annual dicot weeds dominant the weed flora throughout the growing seasons, accounting 85.67 per cent of density and 69.70 per cent of dry matter of total weeds at harvest. Two HW at 30 and 45 DAS brought about the maximum reduction in weed density and dry matter production at 60, 75, 90 DAS and at harvest and resulted in lowest depletion of nutrients (N, P, K and S) at harvest. The highest weed control efficiency of 88.50 per cent was also obtained with two HW, followed by pendimethalin + HW (88.14 %). The maximum values of growth and yield attributes viz., plant height, branches plant-1, crop dry matter accumulation, umbels plant-1, seeds umbel-1, weight of seeds umbel-1, 1000-seed weight and seed yield plant-1 were obtained with two HW treatment. Two HW, being at par with pendimethalin + HW produced significantly highest seed (15.84 q ha-1), straw (25.27 q ha-1) and biological yields (41.11 q ha-1) as compared to rest of treatments. Pendimethalin + HW remained the most effective treatment among herbicides in improving coriander yield and other attributes with the minimum weed competition index (0.62 %).
The maximum nutrient (N, P, K and S) content, uptake in seed and straw as well as total uptake and protein content in seed were achieved with two HW. Whereas, pendimethalin + HW brought about the maximum essential oil content (0.41 %) and oil out turn (6.47 kg ha-1) from seeds. Pendimethalin + HW gave the significantly highest net returns (Rs. 24072 ha-1) and B : C ratio (2.13). Two HW remained at par with pendimethalin + HW which inturn proved the next best treatment.
Results, further indicate that N+P+K+S balanced fertilization in coriander recorded the significantly highest weed dry matter production at all the stages and N, P, K and S depletion by weeds at harvest. N+P+K+S fertilizations significantly improved the growth and yield attributes of coriander as compared to N+P and N+P+K combination. Application of N+P+K+S also significantly increased the seed, straw and biological yields of coriander by 18.00, 14.58 & 15.91 per cent over N+P and 8.36, 6.88 & 7.44 per cent over N+P+K, respectively. Balanced fertilization also enhanced the potassium and sulphur content in seed and straw, N, P, K and S uptake by crop, essential oil content in seed with the maximum values at N+P+K+S application. Significantly higher net returns (Rs. 17287 ha-1) and B:C ratio (1.63) were achieved by fertilizing the crop with N+P+K+S.
Pendimethalin + HW combined with N+P+K+S fertilizations was found superior treatment combination for obtaining higher yields and net returns in coriander, whereas two HW at 30 and 45 DAS together with N+P+K+S fertilizations was appeared to be the next best treatment combination.
Description
studies on the effect of integrated weed management and balanced fertilization on productivity of coriander (Coriandrum sativum L.)
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Citation
Nagar and Dadheech 2005