Author(s):

M Silambarasan, NK Sathyamoorthy, M Dhananivetha, K Sangli Vikram Kumar and V Kathiravan

Abstract: Herbigation is an application of herbicide through irrigation water can be effectively done through drip irrigation. Drip irrigation (DI) is advanced method of precise application of water most efficiently at the required rate at right time, at the active root zone of the crop. Field trial was conducted during Rabi (Jan - May) season to evaluate the effect of native microbial population under irrigated condition in maize. Application of herbicide through drip and conventional spraying were studied for pre emergence application of single Pre emergence herbigation of atrazine (100% recommended dose), Pre emergence herbigation of atrazine (150% recommended dose), Pre emergence herbigation of pendimethalin (100% recommended dose), Pre emergence herbigation of pendimethalin (150% recommended dose), Pre emergence herbigation of pendimethalin (100% recommended dose) + Blackgram, Pre emergence herbigation of pendimethalin (150% recommended dose) + Blackgram, Pre emergence application of atrazine (100% recommended dose), Pre emergence application of pendimethalin (100% recommended dose), Hand weeding twice (15 and 30 DAS) and compared with Weedy Check. Herbicide application done at second irrigation (3 DAS). No significant difference was observed between herbigation and conventional spraying method on native microbial population at before herbicide application. The plots after herbicide application bacterial population was found to be higher under hand weeding twice and weedy check treatments. All the herbicide applied treatments results lower microbial population at 5 DAS. Initial set back in microbial population was recorded over a period of 30 DAS. Most of the studies has been carried out in some other crops but no studies has been done so far in maize in India. So this study forms a baseline in carrying out herbigation in maize.

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