乐东拟单性木兰幼林营养需求特性研究

Study on Nutrition Required Characteristic of Magnolia Lotungensis Young Forest

摘要:

按正交表L9(34)排列的N、P、K三因素三水平的施肥试验表明:乐东拟单性木兰幼林对肥料反应相当敏感,正交试验9个处理中,以N1P1K1为对照,N1P2K2、N1P3K3、N2P1K2、N2P2K3、N2P3K1、N3P1K3、N3P2K1、N3P3K28个处理使得树高生长增加了7.1%～35.7%,胸径生长增加了9.6%～51.4%,施肥效果最好的处理是N2P3K1,即50g/株尿素、200g/株钙镁磷肥;营养元素N、P、K三要素中,P是主要因子,其次是N,最后是K;乐东拟单性木兰幼林应多施磷肥,但从经济性考虑100g/株钙镁磷肥已足够;同时应施少量的氮肥,即50g/株尿素;不必施钾肥。

Abstract:

According to the table of L9(34),the N,P and K three factors,three levels over fertilization test of Magnolia Lotungensis young forest were studied.The results indicated that Magnolia Lotungensis young forest was sensitive to the fertilizer.In 9 tests of the orthogonal experiment,compared with the CK of N1P1K1,the fertilization effect of other 8 tests such as N1P2K2,N1P3K3,N2P1K2,N2P2K3,N2P3K1,N3P1K3,N3P2K1 and N3P3K2 were obvious,the height growth of the single tree increased to 7.1%~35.7%,the diameter growth increased 9.6%~51.4%,the best test was N2P3K1,namely 50 g tree-1 urea and 200 g tree-1 calcium magnesium phosphate;in the three major factors of N,P and K,the principal factor was P,the next was N and the last was K.Magnolia Lotungensi young forest should be applied more phosphoric fertilizers,but from economy consideration,100 g tree-1calcium magnesium phosphate was enough;simultaneously,should be applied a little nitrogenous fertilizers,namely 50 g tree-1urea;the potassium fertilizer was unnecessary.