Planting geometry and weed management for maize (Zea mays)-blackgram (Vigna mungo) intercropping system under rainfed vertisols
2011
Dwivedi, Sanjay K. | Shrivastava, G.K.
The experiment was conducted during rainy season 2004 and 2005 at Raipur, Chhattisgarh on maize (Zea mays L.) + blackgram (Vigna mungo L. Hepper) intercropping system in Vertisols under rainfed situation. The soil was clayey in texture with medium fertility status and neutral in reaction with pH 7.2. The experiment consisted of five planting geometry, viz. sole maize, sole blackgram, maize + blackgram (1:1), maize + blackgram (2:1) and maize + blackgram (2:2) and four weed management practices, viz. Weedy check, Hand weeding (HW) at 30 days after sowing (DAS), Alachlor 2.0 kg a.i./ha as pre emergence and Alachlor 1.5 kg a.i./ha as pre emergence + HW at 40 DAS. These treatments were evaluated under split plot design with three replications. The finding revealed that weed population (viz. Alternanthera triandra, Cynodon dactylon, Cyprus rotundus and Cynotis axillaries) was highest at 75 DAS except Brachiaria rasoma and other weeds, thereafter decreased with the advancement in crop age in weedy check. At important growth stages of crop. i.e. 50 and 75 DAS and at harvest stage, the maximum reduction in number of total weeds were found with the treatment Alachlor 1.5 kg a.i./ha + HW at 40 DAS and was significantly superior to other treatments. This treatment produced maximum grain and straw yields of maize and blackgram, maize equivalent yield (MEY) and net return. The grain and straw yield of maize, MEY, land equivalent ratio and reduction in total number of weeds at 50 and 75 DAS were highest under maize + blackgram (1:1).
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