A field investigation was carried out at Tamil Nadu Agricultural University, during winter 2011- 12 to evaluate the new formulation of potassium salt based glyphosate (Roundup Crop Shield 460 SL) on weed control in winter irrigated cotton. Experimental results revealed that, post- emergence application of glyphosate at 1800 g a.e. ha-1 at 35 and 70 days after sowing + Intercultural operation as earthing up at 45 and 55 days after sowing resulted in lower weed density, weed dry weight and higher weed control efficiency. With respect to the relative weed density, broad-leaved weeds were higher at initial stages and grassy weeds were predominant at later stages of cotton. Higher seed cotton yield was obtained with POE glyphosate at 1800 g a.e. ha-1 at 35 and 70 DAS with + Intercultural operation at 45 and 55 DAS (2930 kg ha-1), which was comparable with PE pendimethalin at 750 g a.i. ha-1 + Intercultural operation at 45 and 55 DAS (2710 kg ha-1). Compared treatments without intercultural operation, intercultural operation carried out treatments performed better and recorded more seed cotton yield.
SUMMARY : : A field experiment with differenttillage practices and land configurations in cottonmaize cropping systems was conducted at TNAU, Coimbatoreduring 2011-12 and 2012-13. Totally there were 8 treatments which were replicated thrice in a Randomized Block Design.The treatments consisted of three tillage practices viz., conventional tillage, reduced tillageand zero tillage and three types of land configurations viz., flat bed and furrow irrigated raised bed (FIRB) which were compared with the existing practice of ridges and furrows. The result of two cropping cycles revealed that the growth parameters and seed cotton yield of cotton were higher in the reduced tillage to both cotton and maize and planting on FIRB which was on par with conventional tillage to both cotton and maize and planting on ridges and furrows (existing practice as check), conventional tillage to both cotton and maize and planting on FIRB, reduced tillage to both cotton and maize and planting on FIRB and reduced tillage once to cotton alone and planting on FIRB. In maize, better growth, improved yield parameters and higher yield were recorded in the reduced tillage to both cotton and maize and planting on FIRB.The lowest yield of cotton and maize was recorded in the zero tillage to both the crops and planting on flat bed. In the cotton-maize system, cotton equivalent yield (CEY) was almost similar in reduced tillage to both cotton and maize and planting on FIRB (4784 kg/ha), existing practice of conventional tillage to both cotton and maize and planting in ridges and furrows (4755 kg/ha) and conventional tillage to cotton alone and planting both cotton and maize on the FIRB (4750 kg/ha).How to cite this article : Puvila, P., Siddeswaran, K. and Mariappan, G. (2017). Leaf area index and yield of cotton -maize cropping systems influence by tillage and land configuration. Agric. Update, 12 (TECHSEAR-4):
: A field experiment with different tillage practices and planting management in cotton -maize cropping systems was conducted under irrigated conditions in a sandy clay loam soil at the Tamil Nadu Agricultural University, Coimbatore during 2011-12 and 2012-13. Totally there were 8 treatments which were replicated thrice in a Randomized Block Design. The treatments consisted of three tillage practices viz., conventional tillage, reduced tillage and zero tillage and three types of land configurations viz., flat bed and furrow irrigated raised bed (FIRB) which were compared with the existing practice of ridges and furrows. The two years average of the germination and yields of cotton -maize cropping systems as a whole under different tillage and planting management revealed that the zero tillage with flat surface planting system gave lesser number germination percentage and yield compared with other types of tillage and planting management which was followed by reduced tillage once to cotton alone and planting on FIRB and conventional tillage once to cotton alone and planting on FIRB. Tilled plot got more germination percentage compared to no-tilled plots and more yield was registered with tillage once to cotton alone and planting on FIRB and conventional tillage once to cotton alone and planting on FIRB.
With a view to explore the possibility of developing the most economic and viable intercropping and border-cropping systems with nitrogen management in finger millet, an experiment was conducted at Tamil Nadu Agricultural University, Coimbatore, India during summer season (December-March) under garden land condition. Different inter-crops tested were sorghum, sunflower, lady's finger, onion and cluster beans. The study indicated that intercropping and border-cropping in direct sown finger millet under irrigated condition were possible. The best and most remunerative border-crop as well as inter-crop in finger millet was onion. Application of 90 kg N/ha would be sufficient for such a cropping system in a sandy clay loam soil of medium fertility. Onion and cluster beans exhibited companion effect and sunflower and sorghum exerted competitive effect on growth and production of finger millet.
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