The Coupling Effects Of Water And Fertilizer On The Camellia Oleifera Growth And Fruition

Camellia (Camellia oleifera Abel) is one of four woody edible oil species in the word, and also the most important edible oil tree in the low hilly area of south China. The test is on the basis of camellia balanced fertilization, studying the influence of camellia growth-fructification by coupling of N,P2O5,K2O,H2O searching the demand law of water and fertilizer on camellia growth, getting the best cultivated plan, and providing the basis theory for the high quality and efficiency development of sustainable camellia. Research conclusions are as follows:(1) There are significant effects on the camellia growth-fructification by fertilizer and water, and the effect is different in both of single factor and the coupling between two factors.(2) The effect of main coupling factors is different on the growth and physiological indexes of camellia, and it has a certain rule between water and fertilizer requirement. Some correlation is found between growth and physiological index, The nutrients promoting effects primarily on the growth of camellia, the affection size of leaf area and yield as for N> Water>P2O5>K2O; water promoting effects primarily on the Camellia physiological indexes, the affection size of camellia SPAD and photosynthesis as for Water>P2O5>K2O>N.(3) There are coupling effects between water and fertilizer factors on camellia growth and physiological index. When the other two factors for zero level, there exists fertilizer coupling effects on camellia spring length from N and P2O5, P2O5and K2O; N and P2O5, P2O5and H2O respectively have coupling effects on camellia leaf weight; P2O5and H2O, K2O and H2O have coupling effects on camellia SPAD; the camellia photosynthetic is effect coupled by N and H2O, and the camellia stomata conductance has significant coupling effect from N and P2O5, K2O and H2O.(4) The use levels of fertilizer and water in the process of camellia to gain maximization growth-fructification are not identical, nutrient and water have the same importance to camellia growth, a reasonable ratio of fertilizer and water can make the best camellia growth. This experiment has get a mode which has the largest proportion of accelerating effects on the yield of camellia, and we make it as the best cultivation mode of camellia, and the respectively code value of fertilizer and water factor as:N=0.91, P2O5=0.65, K2O=0.97, H2O=0.98, in order to appropriate the actual production, The use levels of fertilizer and water will be determined as:the urea0.36Kg/plant, the phosphate fertilizer0.49Kg/plant, the potash0.44Kg/plant, the irrigation water30Kg/plant.