STUDIES ON THE EFFECTS OF SOIL MOISTURE REGIMES AND HERBICIDES ON WEEDS AND MAIZE GANGASAFED-2 AS WELL AS THEIR RESIDUAL EFFECTS ON WEEDS & SUCCEEDING SUMMER CROPS
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Date
1984
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AAU, Anand
Abstract
The field investigations, to study the effect of soil moisture regimes, herbicides and their levels of application on weed control, growth and yield of maize crop and their residual effects on the yield of summer crops were carried out during 1977-78 and 1978-79 at College Agronomy Farm of B.A. College of Agriculture, Anand. It was revealed that lower soil moisture regime of 23 ASH checked weeded population and their dry weight as compared to 30 ASM and 75 ASM. Hand weedings (21 DAS and 35 to 45 DAS) reduced total and dicot weeds upto 90 days, however this practice was not effective in controlling monocot weeds upto 90 days. Among herbicides, atrazine and alachlor were found effective in reducing dry weight as compared to 2,4-D. At 25 ASM, atrazine, alachlor and 2,4-D were at par in reducing dry weight of weeds, however at 50 ASM and 75 ASM, atrazine reduced it by 87.0 and 81.2 per cent compared to 2,4-D. Soil moisture regimes had no apparent effect on plant stand irrespective of weed management. Among herbicides, alachlor depressed plant stand. Grain yield was decreased at 25 ASM as compared to 50 ASM and 75 ASM, At 25 ASM, atrazine and 2,4-D were at par with weeded control and out yielded unweeded control. Similar trend was observed for 50 ASM., At 75 ASM, atrazine and weeded control were at par, however, 2,4-D markedly reduced grain yield. The behaviour of alachlor appeared inconsistent at different moisture regimes.
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AGRONOMY, AGRICULTURE, A STUDY