香水菠萝叶片氮磷钾含量动态变化及其对氮磷钾肥的响应

Dynamic Variation of NPK Content in Tainung No. 11 Pineapple Leaf and Its Response to NPK Fertilizer

以香水菠萝为试验材料,研究缓慢生长期后期至成熟期菠萝叶片氮磷钾含量的动态变化规律,以及氮磷钾肥对菠萝叶片氮磷钾含量的影响。结果表明:当缓慢生长期后期叶片氮磷钾含量处于较高水平时,至快速生长期,叶片氮磷钾含量均呈下降趋势;而当缓慢生长期后期叶片氮磷钾含量处于较低水平时,至快速生长期,叶片氮含量仍呈缓慢下降趋势,但下降幅度较小,而磷钾含量则有所上升;快速生长期至中果期,叶片氮磷钾含量总体上均呈下降趋势,中果期至成熟期,则略有上升。适量增施氮、钾肥能显著提高菠萝叶片氮、钾含量,磷肥对菠萝叶片磷含量的影响则不明显。

Took Tainung No.11 pineapple as test object, the dynamic variation of NPK content in pineapple leaf from late slow growth period to mature period, and the effect of NPK fertilizer on the NPK content in pineapple leaf was studied. The experimental result of two growing seasons indicated that, if pineapple leaf NPK content in late slow growth period was higher, it would gradually decrease at rapid growth period. If it was lower, at rapid growth period, the N content still decreased, but the decrease amplitude was smaller, and the P and K content increased. Leaf NPK content decreased generally from rapid growth period to middle fruit period, and increased slightly at mature period. Appropriate application of N and K fertilizer could increase N and K content of pineapple leaf obviously, but the effect of P fertilizer on pineapple leaf P content was not significant.