Please use this identifier to cite or link to this item: http://krishikosh.egranth.ac.in/handle/1/5810043714
Authors: SHAH, SACHINKUMAR CHIMANLAL
Advisor: TRIVEDI, G. C.
Title: EFFECT OF WEED MANAGEMENT PRACTICES AND SEED RATES ON WEEDS, YIELD ATTRIBUTES AND YIELD OF WHEAT CV. GW-496
Publisher: AAU, Anand
Language: en
Type: Thesis
Agrotags: AGRONOMY, AGRICULTURE
A STUDY
Keywords: EFFECT OF WEED MANAGEMENT, PRACTICES AND SEED RATES ON WEEDS, YIELD ATTRIBUTES, YIELD OF WHEAT CV. GW-496
Abstract: A field experiment was conducted at the college agronomy farm, B. A. College of Agriculture, Gujarat Agricultural University, Anand Campus, Anand to find out "Effect of weed management practices and seed rates on weeds, yield attributes and yield of wheat cv. GW-496" during rabi season of 2001-2002. The soil of the experimental area was loamy sand in texture having good drainage capacity with 7.8 pH. The experiment was laid out in factorial randomized complete block design with four replications. Eighteen treatment combinations comprising three different seed rates (120, 160 and 180 kg/ha) and six weed management practices (2,4-D 0.50 kg/ha at 30 DAS, pendimethalin 0.90 kg/ha pre emergence, pendimethalin 0.45 kg/ha pre emergence + 2,4-D 0.50 kg/ha at 30 DAS, pendimethalin 0.45 kg/ha pre emergence + HW at 30 DAS, Hand weeding at 30 and 45 DAS and weedy check). The results indicated that treatment of 180 kg seed/ha (S3) recorded lowest count of monocot, dicot and total weeds at 30 and 45 DAS and at harvest as well as significantly the lowest dry weight of total weeds at 45 DAS and at harvest with 60.75 % WCE. Successive increase in seed rates from 120 to 180 kg/ha increased the yield attributes and yield. Germination count was highest with S3 and lowest with Si treatment, while plant height measured at 30 and 45 DAS and at harvest was found to be non significant. However, S1 (120 kg seed/ha) treatment recorded significantly the highest number of effective and total tillers per plant. Test weight and protein content were found to be non-significant due to different seed rates. Significantly the highest grain and straw yields (5071 and 7274 kg/ha, respectively) were recorded under S3 treatment. The highest nitrogen, phosphorus and potash uptake by weeds at harvest were recorded under 120 kg seed/ha (S1). While, it was lowest with 180 kg seed/ha (S3). Weed management practices significantly lower down the monocot, dicot and total weeds count at 30 and 45 DAS and at harvest. Pre-emergence application of pendimethalin 0.90 kg/ha (W2) recorded least no. of monocot, dicot and total weeds at 30 and 45 DAS and at harvest while, it was highest under weedy check. The weed free treatment (HW at 30 and 45 DAS) recorded significantly lower dry weight of total weeds at 45 DAS and at harvest (38.57 and 257.47 kg/ha, respectively) with 69.87 % weed control efficiency. Growth and yield attributes of wheat crop were also influenced by weed management practices. Pre-emergence application of pendimethalin 0.90 kg/ha (W2) recorded significantly higher plant height as compared to weedy check (We) treatment at 30 and 45 DAS and at harvest. Similarly, the no. of effective and total tillers per plant were recorded highest under same treatment. Treatment of twice hand weedings at 30 and 45 DAS (W5) recorded significantly higher test weight than rest of the treatments except treatment We. While W2 treatment recorded significantly iiigher protein content of grains but was comparable with W3, W4 and W5 treatments. Grain and straw yields were recorded significantly highest and lowest under W2 and We treatments, respectively. Whereas, W2 and W5 treatments both were at par with each other and recorded significantly lowest uptake of nitrogen, phosphorus and potash by weeds at harvest. Interaction effect S x W revealed that treatment combinations S2W2 and S3W2 were recorded lowest count of monocot, dicot and total weeds'at 30 and 45 DAS and at harvest. Treatment combinations S3W2 at 45 DAS and S3W5 at harvest were found to be superior with respect to recording lower dry weight of total weeds. Whereas, Si We treatment combination recorded significantly the highest dry weight of total weeds at 45 DAS and at harvest. Treatment combination S2W2 recorded significantly higher grain yield but was at par with S3W5, while S3W5 was recorded significantly higher straw yield but was comparable with S3W4 and S3W3 treatment combinations. Uptake of nitrogen, phosphorus and potash by weeds was recorded highest and lowest under treatment combinations S1W6 and S3W2, respectively at harvest. Looking to the economics of various treatment combinations, S3W5 realization maximum net profit (Rs. 23490/ha) followed by S3W2 and S2W5. However, CBR value was recorded highest under treatment combination S2W5 (1:2.91) followed by S3W5 (1:2.90)andS3W, (1:2.82).
Subject: Agronomy
Theme: EFFECT OF WEED MANAGEMENT PRACTICES AND SEED RATES ON WEEDS, YIELD ATTRIBUTES AND YIELD OF WHEAT CV. GW-496
Research Problem: EFFECT OF WEED MANAGEMENT PRACTICES AND SEED RATES ON WEEDS, YIELD ATTRIBUTES AND YIELD OF WHEAT CV. GW-496
These Type: M.Sc
Issue Date: 2003
Appears in Collections:Theses

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