磷肥和有机肥对白菜产量及土壤磷库的影响（征文）

采用2年的微区筒定位试验研究了磷肥和有机肥对白菜产量、白菜全磷、土壤全磷、有机磷、Olsen-P、水溶性磷及生物有效磷等的影响。结果表明，磷肥用量150～600 mg·kg-1土，白菜产量增加14.9%~21.5%； 有机肥用量33.3～133.2 g·kg-1土，白菜产量增加18.2%~25.9%；施用150、300、600 mg·kg-1磷肥和施用33.3、66.6、133.2 g·kg-1有机肥及施用有机肥基础上增施磷肥，白菜产量均无显著变化。施用磷肥和有机肥显著增加白菜的全磷量，大量施用磷肥和有机肥导致白菜对磷的奢侈吸收。随磷肥和有机肥用量的增加，土壤Olsen-P、水溶性磷、生物有效磷均显著增加；随有机肥用量的增加土壤有机磷显著增加。土壤Olsen-P与水溶性磷和生物有效磷呈显著正相关，与土壤有机磷无显著相关性。

Effects of Phosphate Fertilizer and Organic Manure to the Yield of Chinese Cabbage and Soil Phosphorus Accumulation

The yield response of Chinese cabbage to phosphate fertilizer and organic manure was studied in pot experiment for two years. The effect of phosphate fertilizer and organic manure on plant total P content and different soil phosphorus pool were also investigated. Results showed that application of phosphate fertilizer and organic manure significantly increased the yield of Chinese cabbage. Application of phosphate fertilizer at rates of 150-600 mg·kg-1 gave an yield increase of 14.9%-21.5% of Chinese cabbage; there was no significant difference at the rate of 150, 300, 600 mg·kg-1 phosphate fertilizer. Application of organic manure at rates of 33.3-133.2 g·ka-1 gave an yield increase of 18.2%-25.9% of Chinese cabbage; there was no significant yield response to phosphate fertilizer after applying organic manure. The plant total P content of Chinese cabbage was increased gradually with the increase of the rate of phosphate fertilizer and organic manure; Phosphorus was absorbed luxuriously with excessively applying phosphate fertilizer and organic manure. The content of Olsen-P, soil water-soluble P, biological available-P were increased with the increase of phosphate fertilizer and organic manure, Organic phosphorus was increased with the increase of organic manure. Soil Olsen-P was linearly correlated with water-soluble P and biological available-P, but there was no significant correlation between Olsen-P and Organic-P.