施肥对香榧枝梢生长和结实量的影响

采用田间试验的方法,对不同大小树体的香榧进行了施肥试验,分析施肥对香榧树的新梢生长和结实量的影响。结果表明:菜籽饼肥对当年新梢的生长没有产生显著影响;当年新梢生长量随复合肥施肥量的增加呈现先增加后略降的变化规律,过量施用复合肥会对新梢当年生长量产生抑制影响。翌年新梢生长量以及当年和翌年结实量不随菜籽饼肥和复合肥施肥量的增加而无限增加,而是不同树体新梢生长量和结实量趋于最大值时,分别存在各自对应的最佳(最小)施肥量;树体越大,新梢生长量和结实量趋于最大值所需要的最佳施肥量也越大。同类树体在施肥量相同条件下,菜籽饼肥对当年新梢生长的促进影响小于复合肥,而对翌年新梢生长的促进影响则大于复合肥。两种肥料对当年结实量的影响没有显著差异,菜籽饼肥对翌年结实量的影响作用大于复合肥。

Effects of Fertilization on Shoot Growth and Fruit Yield of Torreya grandis

We determined the shoot growth and fruit yield of Torreya grandis with different amount of fertilization in the first and second year, and studied the effect of fertilization on the shoot growth and fruit yield of I.grandis.The rapeseed cake had no effect on new growth shoot in the first year , while the relationship between the amount of composite fertilization and the production of new shoot in the first year was pronounced , the production of new shoot in the first year was initially in-creased and then decreased with increment amount of composite fertilization , and over-fertilization of composite fertilizer would inhibit the growth of new shoot .The growth of new shoot in the second year , fruit production in two years would not increase with the rapeseed and composite fertilization endlessly , however, the maximum new shoot growth and fruit output was reached at the optimal ( minimum) rate of fertilization based on the tree size .The bigger trees required greater amount of optimal ( minimum) fertilization to achieve the maximum growth of new shoot and fruit yield .For the trees of same size with equal amount of fertilization , rapeseed fertilizer had less facilitation effect on new shoot growth in the first year than composite fertilizer , but rapeseed fertilizer promoted shoot growth more prominently in the following year .Two fertilizers didn’ t have obvious divergence for the promotion of fruit yield in the first year , while rapeseed cake had a more positive impact on the fruit output than composite fertilizer in the second year .