Indian Journal of Agronomy

  • Year: 2017
  • Volume: 62
  • Issue: 4

Effect of weed management options and nitrogen scheduling on weed dynamics and yield of wheat (Triticum aestivum) under Central Plain Zone of Uttar Pradesh

  • Author:
  • Naushad Khan1,, Sanjai Chaudhry2, M.Z. Siddiqui3, R.A. Yadav4, Karam Husain5
  • Total Page Count: 6
  • DOI:
  • Page Number: 464 to 469

1Associate Professor (Agronomy) Chandra Sekhar Azad University of Agriculture and Technology, Kanpur, Uttar Pradesh

Chandra Sekhar Azad University of Agriculture and Technology, Kanpur, Uttar Pradesh 208 002

2Assisant Professor (Agronomy) Chandra Sekhar Azad University of Agriculture and Technology, Kanpur, Uttar Pradesh

3Associate Professor (Agronomy) Chandra Sekhar Azad University of Agriculture and Technology, Kanpur, Uttar Pradesh

4Professor (Agronomy) Chandra Sekhar Azad University of Agriculture and Technology, Kanpur, Uttar Pradesh

5Professor (Agronomy) M. Sc. Agric. Student, Department of Agronomy, Chandra Sekhar Azad University of Agriculture and Technology, Kanpur, Uttar Pradesh

Abstract

A field experiment was conducted during the winter (rabi) seasons of 2014–2015 and 2015–16 at Kanpur, Uttar Pradesh, to study the effect of weed-management options and nitrogen scheduling on weed dynamics and yield of wheat (Triticum aestivum L.). Common infesting weeds which appeared in wheat field were Phalaris minor Retz. and Cynodon dactylon (L.) Pers. among grasses, and Chenopodium album L., Anagallis arvensis L., Melilotus alba Medik. and Convolvulus arvensis L. as broad-leaf weeds. Moreover, among sedges, only 1 species, Cyperus rotundus L. was observed. Among the weed-management options, mesosulfuron-methyl + Iodosulfuron-methyl sodium (400 g/ha) with higher dose of nitrogen (150 kg N/ha) applied in 3 spilt applications [50% as basal + 25% at crown-root initation (CRI) + 25% at flowering] proved significantly superior in minimizing the density (33%) and biomass of weeds (34%) at 60 days after sowing (DAS). The former treatment increased the leaf-area index (LAI) and SPAD values that elevated the production of wheat grain yield. Among time of nitrogen application, 3 splits (50% as basal + 25% at CRI + 25% at flowering) enhanced the nutrient-uptake efficiency (27.4%) and total nutrient uptake (40.2%) by crop than 3 equal splits at sowing (basal), CRI and flowering. Higher dose of nitrogen (150 kg N/ha) resulted in higher yield (15.7%) and nutrient uptake (13.4%) than its lower dose. Thus, application of ready-mixed post-emergence herbicides, i.e. mesosulfuron + iodosulfuron (400 g/ha) with higher dose of nitrogen (150 kg N/ha) applied 50% as basal and 25% top-dressed at CRI and 25% at flowering was most effective with respect to weed-suppression, yield and economics of wheat.

Keywords

Herbicide mixture, Leaf area index, SPAD value, N uptake efficiency