论文部分内容阅读
加勒比松幼林基肥试验结果表明，施基肥后１～３ａ肥效显著，以第２ａ的肥效最大，树高、地径比不施基肥的分别增加 ５６％～９４％和 ２９％～６０％； ６ ａ后肥效下降，但施基肥的树高、胸径、材积仍比不施基肥的有所增长。基肥对树高的效应大于对径粗的效应。氮、磷、钾配合施用的效果最佳，但当氮、磷、钾相同配比（Ｎ_（３０）Ｐ_（３０）Ｋ_（３０））时，则有特殊的低效应。在施氮、磷、钾全肥时，前期配施氮对加勒比松生长有利，而磷、钾的肥效较持久。氮、磷、钾无机肥配施滤泥在２ａ内无增产效果，３ａ后方显肥效。６ａ树龄时，氮、磷、钾配施滤泥与单施无机肥相比，胸径、材积分别有所增长。
The results showed that the base fertilizer increased significantly by 56% ~ 94% and 29% ~ 60% of the tree height and diameter at 6 days after application of basal fertilizer After fertilizer decreased, but the base fertilizer tree height, DBH, volume is still higher than the non-base fertilizer. The effect of basal fertilizer on the tree height is greater than the effect on the diameter of the tree. N, P and K had the best combination effect, but there was a special low effect when N, P, K were the same (N 30 P 30 K 30). In the application of nitrogen, phosphorus and potassium all fertilizer, pre-application of nitrogen is beneficial to the growth of caribbean pine, and phosphorus and potassium fertilizer more lasting. Nitrogen, phosphorus and potassium inorganic fertilizer with mud in the 2a without stimulation effect, 3a rear fertilizer effect. 6a age, nitrogen, phosphorus and potassium with mud and single application of inorganic fertilizer compared to the diameter and volume were increased.