Effects Of Different Species And Application Rate Of Nitrogen Fertilizer And Irrigation Amount On The Growth And Yield Of Cassava

In recent years, the development of cassava industry has not improved significantly, but the amount of fertilizer has increased year by year, and the fertilization problem is serious. In order to develop the efficient and productive agriculture this study carried out the research with different amounts of nitrogen, irrigation quantity and nitrogen species on cassava growth, in order to explore the growth promoting cassava, to achieve high efficient results. Based on field trials, this study continue to carry out greenhouse pot experiment with the effect of different amounts of nitrogen, irrigation quantity and nitrogen species on the chlorophyll content, total nitrogen, total phosphorus impact, total potassium and agronomic traits such as plant height of cassava. The main conclusions of this study were as follows:1. Tests showed that at the same amount of nitrogen, ammonium nitrate is more conducive to the formation of the chlorophyll compared to ammonium sulfate. While normal irrigation can promote the formation and accumulation of chlorophyll in plants better than drought.2. When in different irrigation levels:drought is better than normal irrigation combined with the conservation of water resources and the increased yield. But, normal irrigation can better promote the absorption of phosphorus and potassium of cassava, has a good help on cassava growth and yield important at the same time.3. When in different amounts of nitrogen:when the amount of nitrogen fertilizer is 1.0g/ pots, cassava can absorb more nitrogen than 0.1g/pots. But too much nitrogen will inhibit the absorption of phosphorus and potassium of cassava, although the effect is not obvious.4. Indifferent nitrogen species:the study found that, the improvement of the nutrient content of cassava is:ammonium nitrate> ammonium sulfate> urea when normal irrigation and ammonium sulfate> ammonium nitrate> urea when drought.5. There is a found with the study of cassava yield that when the amount of nitrogen fertilizer is 1.Og/pots and normal irrigation, the yields of cassava is higher, while ammonium nitrate as a fertilizer to increase cassava production better.6. In field test, the program that the irrigation quota is 100 m3/666.7 m2 and the amount of urea is 25kg/666.7 m2, is the most suitable for the growth of the production of cassava.In summary, in the greenhouse pot experiment, when use ammonium nitrate as fertilizer, and the amount of nitrogen fertilizer is 1.0g/pots with normal irrigation (soil relative water content of about 65%-70%), can increase the growth and production of cassava best. But, when combined with saving fertilizer and water, use ammonium sulfate as fertilizer, and the amount of nitrogen fertilizer is 0.1g/pots with drought, can also effectively improve the nutrient content and yield of cassava.