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A comprehensive study was made in irrigated rice to optimise the integrated nutrient and weed management practices for augmenting rice productivity, at Annamalai University, Experimental Farm, Annamalai Nagar, Tamil Nadu, India. The experiment was laid out in split plot design with three replications. The details of the treatment in main plots are M1 - Un weeded control, M2- Hand weeding (HW) twice at 20 and 40 DAT (Farmers practice), M3 - Butachlor 1.25 kg a.i ha-1 + one hand weeding (25 DAT), M4 - Pretilachlor 0.75 kg a.i ha-1 + one hand weeding (25 DAT) and the sub plots S0 - Absolute control (no organic and inorganics), S1 - RDF through inorganic fertilizers (150: 50: 50 kg N, P2O5, K2O), S2 - 75% recommended dose of N + recommended dose of P and K + 25 % N on equivalent basis of composted vermicompost, S3 - 75% recommended dose of N + recommended dose of P and K + 25 % N on equivalent basis of composted pressmud, S4 - 75% recommended dose of N + recommended dose of P and K + 25 % N on equivalent basis of water hyacinth compost. The results of the study evidently proved that application of pre- emergence herbicide of pretilachlor 0.75 kg a.i. ha-1 + one hand weeding at 25 DAT along with application of 75% recommended dose of N + recommended dose of P and K (112.5: 50: 50 kg N, P2O5 and K2O ha-1) + 25% N on equivalent basis of vermicompost (1400 kg ha-1) as an agronomically efficient, eco friendly and economically viable technology for improving growth, yield and economics of rice. The lowest values for plant height, LAI at flowering, No. of tillers hill-1, and DMP and yield attributes and yield was observed in the treatment M1S0 (unweeded control x no organic/inorganics) at all the stages of observation However, in both the crops treatment M2 S0 was statistically on par with M1S0 at 20 DAT. [ABSTRACT FROM AUTHOR]

Field experiment was conducted to study the effect of weed management practices on weed indices in transplanted kodo millet at the Experimental Farm, Department of Agronomy, Annamalai University, Annamalainagar during Kharif season (June to October), 2014. The treatments consisted of unweeded control (T1), twice hand weeding (T2) (at 20 and 40 DAT), butachlor 50% EC @ 1.5 kg a.i ha-1 (T3), pretilachlor 50% EC @ 0.5 kg a.i ha-1 (T4), 2,4, d-Na salt 80% WP @ 0.75 kg a.i ha-1 (T5), bispyribac sodium10 % SC @ 20 g ha-1 (T6). The field experiment was laid out in randomized block design with four replications. Among the different weed management practices, hand weeding twice on 20 and 40 DAT (T2) recorded the lesser weed intensity percentage on 30 and 60 DAT and recorded higher weed control efficiency and treatment efficiency index on 30 and 60 DAT. This was on par with the application of post emergence herbicide bispyribac sodium @ 20 g a.i ha-1 on 20 DAT (T6). Among the herbicides, lesser weed index was recorded under post emergence herbicide bispyribac sodium @ 20 g a.i ha-1 on 20 DAT, which was followed by Pre-emergence application of Pretilachlor @ 0.5 kg a.i/ha on 3 DAT. Hence it can be concluded that application of post emergence herbicide bispyribac sodium @ 20 g a.i ha-1 on 20 DAT (T6) holds immense potentiality to control all types of weeds in transplanted kodo millet. [ABSTRACT FROM AUTHOR]

Field experiments were conducted at the Annamalai University Experimental Farm, Annamalai nagar, Tamil Nadu to study the effect of Site Specific Nutrient Management for Transplanted Rice Cv. ADT 36 and ADT 43. There are fifteen treatments viz., T1 - 150: 15: 50 kg NPK ha-1, T2 - 150: 30: 50 kg NPK ha-1, T3 - 150: 45: 50 kg NPK ha-1, T4 - 150: 60: 50 kg NPK ha-1, T5 - 150: 15: 75 kg NPK ha-1, T6 - 150: 30: 75 kg NPK ha-1, T7 - 150:45:75 kg NPK ha-1, T8 - 150: 60: 75 kg NPK ha-1, T9 - 150: 15:100 kg NPK ha-1, T10 - 150:30:100 kg NPK ha-1, T11 - 150:45:100 kg NPK ha-1, T12 - 150:60:100 kg NPK ha-1, T13 - LCC:15:80 kg NPK ha-1, T14 - 150:50:50 kg NPK ha-1, T15 - control. The treatments were replicated thrice adopting randomized block design. The study revealed that in both the seasons, growth and yield components viz., plant height, number of tillers hill-1, leaf area index and dry matter production were increased by the application of T8 - 150: 60: 75 kg NPK ha-1. Application of treatment, T8 - 150: 60: 75 kg NPK ha-1 recorded the highest grain yield of 5280 and 5390 kg ha-1 with ADT 36 and ADT 43 respectively. The treatment T8, was followed by the treatment, T12 - 150:60:100 kg NPK ha-1. [ABSTRACT FROM AUTHOR]

Field investigations were carried out during kharif season at Experimental farm, Department of Agronomy, Faculty of Agriculture, Annamalai University, Annamalainagar, to study the effect of different sulphur sources on growth and growth characters of Sunflower variety (Co-4). The experiment was laid out in randomized block design and replicated thrice. The experiment consisted of nine treatments viz., T1- Control (No sulphur only NPK as DAP and MOP), T2-20 kg sulphur ha-1 through Ammonium sulphate, T3 -20kg Sulphur ha-1 through single Super phosphate, T4- 20kg Sulphur ha-1 through Gypsum, T5 -20kg Sulphur ha-1 through Elemental sulphur, T6-40kg Sulphur ha-1 through Ammonium sulphate, T7 -40kg sulphur ha-1 through Single super phosphate, T8-40kg Sulphur ha-1 through Gypsum, T9 -40kg Sulphur ha through Elemental sulphur. The results of the experiments revealed that application of 40 kg Sulphur ha through Ammonium sulphate (T6) significantly influenced the growth attributes in sunflower. This treatment recorded higher values for growth attributes viz., Plant height, LAI, and DMP. This was followed by T7 (40kg sulphur ha-1 through Single super phosphate) in crops. The lowest values for growth attributes were recorded in T1-Control (no sulphur only NPK as DAP and MOP). [ABSTRACT FROM AUTHOR]