Effect of long-term fertilization on the forms of organic phosphorus in paddy soil derived from red earth
2003
Based on the longterm fertilization experiment (19 years) in paddy soil derived from red earth, the method of Bowman and Cole (1978) was applied to study the effect of longterm fertilization on the forms and change of organic phosphorus in paddy soil The results showed that the organic phosphorus contents were 22593 to 32247 mg·kg-1 in surface soil, accounting for 2859% to 4234% of the total P In the various forms of organic P in paddy soil, MLOP was highest (13480 mgkg-1), accounting for 5158% of total organic P, followed by MROP (9246 mg·kg-1, 3538%), HROP (2035 mgkg-1, 779%), and LOP (1367 mg·kg-1, 523%) In the treatment of no P application, it mainly caused the contents of MLOP and MROP to decrease, and the decreased amount was CKNK MROP and HROP contributed most to the increase of organic P with continual P application, and the order of the increase was NPK+OMPNPK The change rate of organic P was different from that of inorganic P under different fertilization treatments The ratio of organic P to inorganic P rose in the no P application, but declined in the continual P application The P supplying capacity was negatively correlated with the organic P/inorganic P ratio (r=-09497*,r005=0878)
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