Agrotechnology

Effect of pre and post emergent herbicide on nutrient uptake and yield in soybean (Glycine max L. Merrill)

2^nd International Conference on Agricultural & Horticultural Sciences

Radisson Blu Plaza Hotel, Hyderabad, India February 03-05, 2014

T M Sudhakara, S Sridhara, Venkata Reddy, S Lohith, V Bhaskar and T Y Akshatha

Accepted Abstracts: Agrotechnol

Abstract:

Soybean ( Glycine max (L.) Merrill) is the premier pulse and oil seed crop in India. Weed infestation in soybean is one of the major hurdles which limit its productivity to a greater extent. A field experiment was conducted during Kharif 2010 at College of Agriculture, Navile, Shivamogga, UAS, GKVK, Bengaluru. The experiment consisted of 11 treatments laid out in RCBD with three replication consisting one pre and three post emergent herbicides compared with two hand weeding at 20 and 40 days after sowing and weedy check. The dominant weed flora associated with experimental field were Celosia argentia, Acanthospermum hispidum, Commelina benghalensis, Borreria articularis, Parthenim hystrophorus, Cleome viscosa, Dactyloctenium aegyptium, Cynodon dactylon, Eleusine indica, Digitaria marginata and Cyperus rotundus . Significantly higher grain and straw yield was noticed (23.12 and 35.83 q ha -1 ) in clethodim 24% EC at 60 g a. i. ha -1 along with NIS + AMS this is on a par with the application of clethodim 24% EC at 48 g a. i. ha -1 along with NIS + AMS ( 21.72 and 33.99 q ha -1 ). This yield was mainly attributed to better expression of growth and yield components as a result of effective weed control of weeds during early stages of crop growth and it helped the crop to utilize available resources i.e., nutrients, moisture, space and light to the full extent. The higher nutrient uptake by crop was recorded with the application of clethodim 24% EC at 60 g a. i. ha -1 along with NIS + AMS (129.47, 23.53 and 105.90 kg ha -1 N, P and K, respectively) and application of clethodim 24% EC at 48 g a. i. ha -1 along with NIS + AMS (115.48, 22.87 and 100.40 kg ha -1 N, P and K, respectively) compare to other treatments. Whereas, higher nutrient uptake by weeds was recorded in unweeded check (32.03, 8.80 and 36.20 kg ha -1 N, P and K, respectively).