Effect of organic residue and nitrogen levels on growth of spring wheat and ryegrass Public Deposited

http://ir.library.oregonstate.edu/concern/graduate_thesis_or_dissertations/9w032556r

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  • The vast area of sandy soils in Thailand which are low in fertility and can hardly hold water, prompted this investigation. A greenhouse study was conducted from December 1978 to April 1980 to find out the effect of straw on nitrogen availability that could affect dry matter yield and nitrogen uptake of spring wheat and ryegrass. A randomized block design with four replications was used. Each replication was composed of 27 treatments which include a factorial arrangement of three levels of straw, nitrogen fertilizer and water. Three crops of spring wheat followed by three cuttings of ryegrass were used as indicator plants. Dry matter yield and nitrogen uptake from both spring wheat and ryegrass were measured. Soils at different periods of cropping were analyzed for total nitrogen, incubated nitrogen and Organic matter content. Results obtained were analyzed statistically to determine the factors significantly affecting dry matter yield, nitrogen uptake, total soil nitrogen, incubated nitrogen and soil organic matter. It was observed in this study that in the first two cuttings of spring wheat, straw depressed dry matter yield when no nitrogen fertilizer was applied but when fertilizer was applied, straw aided in increasing dry matter yield. In the third cutting, however, increasing levels of straw gave higher dry matter yield both with and without nitrogen application. For the first cutting of ryegrass, straw depressed dry matter yield at all levels of nitrogen fertilizer, but in the second and third cuttings, there were inconsistencies in dry matter yield due to added straw. Higher rates of fertilizer always gave higher dry matter yield in ryegrass but only in the second crop of spring wheat. Higher water content of soil always resulted in higher dry matter yield in spring wheat, but not always so in ryegrass. Nitrogen uptake by plants followed dry matter yield closely in most cases. Total soil nitrogen and incubated soil nitrogen decreased slowly following successive croppings. The addition of straw and fertilizer reduced the rate of decrease of total soil nitrogen while increasing straw levels helped to increase the amount of incubated nitrogen. Straw also had a tendency to increase soil organic matter content. Results from this study suggest that straw together with fertilizer could have beneficial effects on dry matter yield, conserve total soil nitrogen and increase soil organic matter.
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