Effect of Long-term Fertilization on Changes and Availability Supply Capality of P, K in Fluvo-aquil Soil

doi:10.7668/hbnxb.2009.S2.064

Abstract

Abstract: In comparison with CK, NPKM increased soil total P content by 52.2%, and that in the treatment of NPK + straw increased by 18.85%, NP, PK and NPK treatment increased by 17.87%, 15.88% and 14.89%, respectively. Above soil total P increases were also higher than those with the treatment of N only or NK. Compared with CK, soil available P increased by 10-fold and 3-fold with the treatment of NPKM and NPK + straw, and 3 -5 fold with NP, PK and NPK. Therefore, application of chemical fertilizer alone without organic manure can keep the balance of K input and output. Addition of NPK along with pig manure and straw increased soil available K by 16. 0% and 11.4% respectively, compared with CK. The available K declined year by year in the treatments without K fertilizer. Changes of soil slow-released K followed similar trend to the available K. Therefore, long-term application of ehemieal K fertilizer or its combined application with organic materials can not only meet the K demand by crops.

Key words: Long-term fertilization, Fluro-aquil soil, P, K, Availability supply capality

CLC Number:

S158

SONG Yong-lin, ZHANG Shu-xiang, LI Xiao-ping, WANG Li-xia. Effect of Long-term Fertilization on Changes and Availability Supply Capality of P, K in Fluvo-aquil Soil[J]. ACTA AGRICULTURAE BOREALI-SINICA, doi: 10.7668/hbnxb.2009.S2.064.

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