Long-term effects of fertilization on the forms and availability of soil phosphorus in rice paddy.
The changes in total P accumulation and P compounds with time in the plough layer in a paddy soil in southern Korea were investigated in relation to the continuous application of chemical fertilizers (NPK), straw based compost (Compost), combination these two (NPK+Compost) for 31 years. Continuous fertilization increased the total and inorganic P contents in plough layers. In NPK, inorganic P fraction did not change with time, but organic P content increased significantly. Long-term application of chemical fertilizer together with compost accelerated the decrease in the organic P fraction, presumably due to promoting microbial activity in the plow layer, and then increased significantly inorganic P fraction. Compost application decreased the residual P and Fe-P fractions and then increased inorganic P fraction, in spite of continuous compost application. Increase in total, inorganic and extractable P with time may be closely related to the increase in the availability of accumulated P for rice growth.
Lee
Chang Hoon
CH
Division of Applied Life Science, Graduate School, Gyeongsang National University, 900, Kaswa-dong, Chinju, 660-701, South Korea.
Park
Chang Young
CY
Park
Ki Do
KD
Jeon
Weon Tae
WT
Kim
Pil Joo
PJ
D002118:Calcium / Q000032:analysis; D018556:Crops, Agricultural; D005308:Fertilizers; D006863:Hydrogen-Ion Concentration; D007723:Korea; D008345:Manganese / Q000032:analysis; D012275:Oryza / Q000254:growth & development*; D010758:Phosphorus / Q000032:analysis*; D011188:Potassium / Q000032:analysis; D012987:Soil / Q000032:analysis*; D013997:Time Factors
D005308:Fertilizers; D012987:Soil; D010758:Phosphorus; D008345:Manganese; D011188:Potassium; D002118:Calcium