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利用12年长期定位试验研究了灌溉和旱作条件下不同施肥处理对土土壤剖面全磷与有效磷(Olsen-P)分布和移动的影响。结果表明,土施磷后主要累积在耕层,极大地提高了0—20cm土层全磷与Olsen-P含量。旱作条件下,施用磷肥或化肥配施有机肥提高了100cm以上土体全磷与Olsen-P含量;而化肥配合有机肥,Olsen-P含量在100—300cm土壤剖面中都高于对照(不施肥)和化肥处理。灌溉条件下,与旱作有相同趋势,但磷钾、有机肥配施氮磷钾处理,全磷和Olsen-P不仅在0—300cm剖面中高于对照和氮磷钾处理,而且也高于旱作条件下的相同处理。土上存在磷素的淋失。
The effects of different fertilization treatments on the distribution and movement of total phosphorus and available phosphorus (P (subscript P)) in soil profiles of irrigated and irrigated land under 12-year long-term experiment were studied. The results showed that the main accumulation of phosphorus in the soil after plow layer was plowing, which greatly increased the content of total phosphorus and Olsen-P in 0-20cm soil layer. Under the condition of dry cultivation, the application of phosphate fertilizer or chemical fertilizer combined with organic manure increased the total phosphorus and Olsen-P content of soil above 100cm; while the chemical fertilizer combined with organic manure, the content of Olsen-P in 100-300cm soil profile was higher than that of the control Fertilization) and fertilizer treatment. Under irrigated conditions, the same trends as in the rainfed crop, however, the treatments with NPK and NPK combined with total phosphorus and Olsen-P were not only higher than the CK and NPK treatments in the 0-300cm profile but also higher than the drought The same treatment as in the conditions. soil leaching of phosphorus present.