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Studies the Effects of Nitrogen, Phosphate, Potassium Fertilizer and Clipping Frequency on the Yield of Russian Wildrye Grass

Sun Yan(Beijing Agricultural College, Beijing 102206)Shi Dekuan(Institute of Grassland Science, China Agricultural University, Bejing 100094)Yang Qingchuan(Institute of Animal Science, CAAS, Beijing 100094)  
Studies were conducted for one year at Fishlike mountain Farm, Chengde District to de-temine the effect of nitwn, phosphate, potassiurn fertilizer and clipping boency on the yteld of hay ofRussian wilthe grass. Mathemaics medels were established for yield with the betments of N, P, K fertil-izer and clipping frequency in this paper. The dynamic relationship between enyriment factors and vieldwere analyzed by computer and showed by graphs. The results show that: There are interactions among thenitrogen, phosphae, potassiurn fertilizer and clipping boency. The interactions between nitrogen andphosphate fertilizer, nitrogen fertilizer and clipping frequency are large. The interaction between potassiumfertilizer and clipping times is small. The best combine of nitrogrn, phosphate, potassium fertilizer andclipping boency are nitrogen 312kg, phosphate 171kg, potassiurn 125kg, clipping 2 times per hectareper year. The frequency analysis method gives the manipulation of which can keep yield of Russianwildrye grass in a given level.
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