EFFECT OF WEED MANAGEMENT PRACTICES AND RHIZOBIUM INOCULATION ON GROWTH AND YIELD OF PEAS (Pisum sativum L.)
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Date
2002
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AAU, Anand
Abstract
A field investigation was carried out during Rabi season of 2001-2002 on loamy sand soil of College Agronomy Farm, under AICRP on Weed Control, BA. College of Agriculture, Gujarat Agricultural University, Anand to study the "EFFECT OF WEED MANAGEMENT PRACTICES AND RHIZOBIUM INOCULATION ON GROWTH AND YIELD OF PEAS (Pisum sativum L.)". Eight weed management treatments comprising three pre-emergence herbicides each at two levels viz., fluchloralin (0.45 and 0.90 kg/ha), pendimethalin (0.50 and 0.75 kg/ha) and alachlor (0.60 and 1.2 kg/ha). Hand weedmg twice at 15 and 30 DAS and weedy check combined with and without Rhizobium inoculation under factorial randomized complete block design with four replications. Seed treatment with Rhizobium moculation was given in the morning on the day of sowing. Herbicides application were made the next day of sowing with the help of knapsack sprayer fitted with a flatfan nozzle using 500 litre water/ha spray solution. The net plot size was 12.0 m2. The pea crop (cv. Arkel) was sown on 27th November, 2001 with row spacing of 30 x 10 cm using seed rate 120 kg/ha. The crop received a uniform dose of 20 kg nitrogen, 75 kg phosphorus and 35 kg potash as urea, single super phosphate and murate of potash. The crop was harvested on 18 February, 2002. The study indicated that among different weed management treatments, hand weeding twice at 15 and 30 DAS followed by pendimethalin 0.5 and 0.75 kg/ha were most effective in controlling weeds. These treatments reduced the dry weight of weeds 136.87, 522.29 and 585.10 kg/ha, respectively) by 88.00 to 97.2% as compared to unweeded control (4881.56 kg/ha). The Rhizobium inoculation treatments were not significantly different. Of the different weed control treatments, the higher pod yield was obtained under treatment hand weeding twice at 15 and 30 DAS (8547 kg/ha), followed by pendimethalin 0.75 and 0.5 kg/ha and fluchloralin 0.9 kg/ha having 7724, 7314 and 7233 kg/ha, respectively. The yield differences among these treatments were not significant. Plant growth as well as yield attributing characters were higher under these treatments. The Rhizobium inoculation treatments were not significant but they are superior than the lowest pod yield (3175.00 kg/ha) recorded under weedy check with weed index (62.85%). Weed control practices restricted the nutrient removal by weeds substantially compared with the unweeded check. Weeds removed 262.63, 60.04 and 304.61 kg N, P2O5 and K2O ha, respectively. The protein content (%) of pea seeds were also significantly influenced by weed management practices. The highest protein (9.18 %) was recorded during third picking in treatment W3 (Pendimethalin 0.5 kg/ha). Correlation studies indicated that all weed parameters were negatively correlated with pod yield and yield attributes. The highest net returns (Rs. 53,856/ha) was obtained by the hand weeding twice at 15 and 30 DAS + Rhizobium inoculation followed by hand weeding twice without Rhizobium inoculation, (indicates that seed treatment with Rhizobium inoculation was not much more beneficial) pendimethalin 0.5 kg/ha + Rhizobium inoculation which gave net profit of Rs. 50,328 and 50,099/ha, respectively. The benefit : cost ratio were also higher in these treatments (2.49 - 2.59).
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AGRONOMY, AGRICULTURE, MANAGEMENT