Available phosphorus status and critical threshold for leaching in greenhouse soils influenced by different fertilizer sources

In this paper, laboratory soil incubation experiment was conducted to investigate soil available P (Olsen-P) and calcium chloride extracts P (CaCl2-P) contents influenced by manure and inorganic P sources at different rates in three soils with different planting years in Raoyang County, Hebei Province.The three soils included soil next to the greenhouse without planting vegetables (control), plastic greenhouse soil with 30 years of planting vegetables (plastic greenhouse soil) and solar greenhouse soil with 4 years of planting vegetables (solar greenhouse soil). The main purpose was to study the effects on available P content in greenhouse soils and determine the threshold of P leaching under manure and inorganic fertilizers application by mathematical stimulation.

本研究开展室内土壤培养试验，旨在探究河北省饶阳县3种不同种植年限土壤中，不同施用量的有机肥与无机磷源对土壤有效磷（Olsen-P）及氯化钙提取态磷（CaCl₂-P）含量的影响。供试土壤共3种，分别为未种植蔬菜的温室旁对照土壤、种植蔬菜30年的塑料大棚土壤，以及种植蔬菜4年的日光温室土壤。本研究的主要目的为明确有机肥与无机肥配施对温室土壤有效磷含量的调控效应，并通过数学模拟确定该配施模式下的磷淋失阈值。