TY  - BOOK
AU  - Lyngdoh, Risakaru
AU  - Rajesh Kumar
TI  - Weed management in maize(Zea mays L.) through legume inter cropping /                                                                                        
U1  - 633.1595 
PY  - 2012///
CY  - Umiam
PB  - CPGS, CAU
KW  - Maize
KW  - Weed management
KW  - Legume intercropping
N2  - Abstract:

A field experiment was conducted at the upland Agronomy Research farm of the ICAR RC for NEH Region, Umiam during kharif of 2010 to study Weed management in maize (Zea mays L.) through legume intercropping. The experiment was carried out in a Factorial Randomized Block Design with twelve treatments replicated thrice. The treatments were (i) sole maize (ii) maize + groundnut (iii) maize + soybean (iv) control (no weeding) (v) one hand weeding (vi) two hand weeding (vii) mechanical method. Periodical observations were taken for various parameters. Among the intercropping situations maize + groundnut produced highest grain yield (63.86 q ha-1 ) and among the weed management it was found with two hand weeding (67.67 q ha-1). Maize height and dry matter production was found to be significantly increased in maize + soybean intercropping and with two hand weeding. In general, the yield attributes of maize viz., cobs number plant-1, cobs weight plant-1, cobs length was found to be significantly superior with maize + ground nut intercropping system and associated with two hand weeding. Intercrops grain yield was also found to be significantly increased due to intercropping and was associated with two hand weeding. Harvest index (HI) of maize was not affected by intercropping as compared to the HI of intercrops, but weed management significantly increased the HI of maize but not the HI of intercrops. Highest MEY was achieved with maize + soybean and with two hand weeding. LER was found to be highest in maize + soybean. Total N, P and K uptake in maize was found in maize + soybean, sole maize and maize + soybean intercropping system respectively. Among the weed management methods two hand weeding produced maximum total N, P and K uptake in maize. Sole maize recorded highest weeds dry weight along with control treatment (no weeding). Similarly, highest weeds density was found with sole maize in the control plots. In the experimental field broadleaf weeds such as, Borreria hispidia (L.), Amaranthus viridis (L.), Ambrosia artemisiifolia (L.), Ageratum conyzoides (L.), Commelina benghalensis (L.), Galinsoga parviflora Cav, Alternanthera philoxeroides (L.), Bidens pilosa (L.), Chromalaena odorata (L.) sedges and grasses such as Cyperus rotundus (L.), Cynodon dactylon (L.), Digitaria sanguinalis (L.), Eleusine indica (L.) were observed. WME was found to be higher with maize + soybean at harvest of maize whereas two hand weeding significantly increased the WME at 20 DAS, 40 DAS and at harvest of crop. Maize + soybean show maximum net return and highest B:C ratio among the intercropping situations whereas two hand weeding gave the highest net return among the weed management and highest B:C ratio was recorded in mechanical weeding.
ER  -