Browse on keywords: weed nitrogen
Search results on 06/18/13
5735. Rasmussen, P.E. and C.R. Rohde. 1988. Stubble burning effects on winter wheat yield and N utilization under semiarid conditions.. Agronomy J. 80:940-942.
Burning vs. not burning was examined at 3 nitrogen levels over 6 years (3 crops). Burning had no effect on grain yield or grain N uptake. Burning increased straw yield when wheat was fertilized by N, but had no effect on straw N uptake. Burning did not decrease foot rot incidence or severity, but did reduce downy brome density. T: Effects of stubble burning and N fertilization on grain and straw of winter wheat 1980-85. Effect of stubble burning on foot rot infection. Effect of stubble burning on downybrome infestation.
6276. Singh, H. and J.P. Agarwal. 1983. Studies on nitrogen fertilization and weed management in wheat.. Indian J. Agron., 28(1):23-29.
About 40-45 kg N/ha could be saved by pre-emergence application of tribunil over the conventional method of weeding.
6293. Singh, H.P. and J.P. Agerwal. 1982. Studies on nitrogen fertilization and weed management in wheat.. Indian J. Agron., 27(1):71-77.
Nitrogen fertilization did not affect composition, density and dry matter accumulation in weeds. The concentration of N in weeds tended to increase with nitrogen application. Tribunil for weed control. Liberal doses of fertilizers and frequent irrigation have been adopted to realize maximum yields in Mexican dwarf wheats, and have stimulated the rank growth of weeds. The weed flora of wheat has greatly changed in the recent past and some new obnoxious non-legume weeds like Phalaris minor and Avena fatua have come into prominence. Similarity to wheat plant in early stages.
6301. Singh, R.A., O.P. Singh and M. Singh. 1976. Effect of soil compaction and nitrogen placement on weed populations.. Plant and Soil, 44:87-96.
Field experiements showed that soil compaction did not affect wheat yield significantly under rainfed conditions. Weed population was significantly reduced due to soil compaction. Compaction decreased total moisture use and increased water use efficiency. Weed population was not affected due to nitrogen placement. Under rainfed conditions, deep placement of nitrogen was important for increasing the efficiency of fertilizer as well as water utilization by wheat crop.
7496. Wells, G.J.. 1979. Annual weed competition in wheat crops: the effect of weed density and applied nitrogen.. Weed Research, 19:185-191.
The relationship between dry matter production and population density for all but one weed species was curvilinear, competition in the wheat crop was linear for four of the five weed species. Large differences in the competitive ability of individual weed species. Applied nitrogen increased wheat yields at all sites, but weed competition was not affected.