Organic amendments increase soil phosphorus availability and yield in field-grown cabbage and Chinese cabbage
2018
Li, R. N. | Zhang, Y. C. | Huang, S. W. | Wang, Laura Y. | Tang, J. W. | Chen, L. L. | Zhai, F. Z.
Conventional management with excessive application of phosphorus (P) leads to P enrichment in the soil and increases the risk of P leaching. A survey of soil chemical properties was carried out in the main production regions of open-field Chinese cabbage in Hebei province, China. The results indicated that unrestrained fertilization, mainly as 15-15-15 compound fertilizer, was the greatest problem which led to lower organic matter content and excessive P accumulation at the top 20 cm soil layer. An experiment was conducted on the spring cabbage-autumn Chinese cabbage rotation system. The aim of this study was to find the influence of combined application of organic amendments with chemical fertilizers on soil organic matter accumulation, P availability and vegetable yield. The fertilization rates, nitrogen (N), phosphate (P2O5) and potash (K2O) were recommended as 300, 150 and 300 kg ha-1, respectively, in cabbage season, and 300, 150 and 450 kg ha-1 in Chinese cabbage season. The results showed that soil organic matter content slightly decreased under chemical fertilizer-only treatment over time. Under the same amounts of nutrient inputs, straw amendment could improve soil organic matter content because of the higher carbon (C) input. However, under the short term view, straw C had a lower rate of transformation to soil C than pig manure after applying into the soil. Chemical fertilizer applied with pig manure showed a better effect on building up soil available P and achieving higher vegetable yield.
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