苗木指数施肥技术研究进展

Advances in Study on Seedling Exponential Fertilization Regime

概括并总结国内外指数施肥的研究现状和作用机制,主要包括:1)指数施肥可以有效促进苗木的养分吸收、提高苗木养分承载量;2)实施指数施肥育苗的过程中,贫养阶段苗木生物量和养分含量随着供养量的增加而显著提高,达到充足供养量后苗木进入奢养消耗阶段,生物量停止增加,超过最适供养量的养分添加会对苗木造成毒害;3)移栽后,指数施肥培育的苗木体内贮存的大量养分更有利于苗木的养分再分配,从而有效改善苗木定植后的生长。目前国外指数施肥的研究已经达到应用水平,国内相关研究尚少,对优质、高效育苗构成限制。

This paper summarized the study progress in mechanisms for plant responses to exponential fertilization technique in the nursery and in the field. 1） Exponential fertilization regime promotes nutrient uptake and nutrient load efficiently; 2） In the process of the exponential fertilization,biomass and nutrient content increase significantly as nutrient supply increases during the nutrient deficiency phase; higher internal nutrients reserved during the luxury nutrient consumption phase,and toxicity occurs if applied nutrient quantities exceed the optimum level; 3 ） The exponential fertilization regime promotes nutrient retranslocation after transplantation,due to high nutrient reserves in the seedlings reared in this regime,which is good for establish of the transplanted seedlings. There are much researches on the exponential fertilization regimes abroad,and in the future this technique should be studied in China to help promote seedling quality.