Effects of Rice Straw Incorporation and Soil Pre-Flooding on the Fate of Applied ( ̄(15)NH4)2SO4-N and Growth of RiceEnglish Full Text
HUANG ZHIWU and LU RENJUN(Laboratory of Plant Nutrition, South China Agricultural University, Guangzhou 510642 (China))
Abstract: A pot experiment was conducted to investigate the effects of straw incorporation and soil pre-flooding on the fate of ( ̄(15)NH4)2SO4-N and the growth of rice. Excessive application of rice straw when incorporated with ( ̄(15)NH4)2SO4 at the C/N ratio of 40 reduced the loss of ( ̄(15)NH4)2SO4-N and retarded the growth and development of rice significantly, while no adverse effects were observed on dry weight of panicle and the total recovery of ( ̄(15)NH4)2SO4-N when rice straw was incorporated with ( ̄(15)NH4)2SO4 at a C/N ratio less than 25. There were no significant effects of duration of soil pre-flooding within 6 weeks on ( ̄(15)NH4)2SO4-Nuptake by rice and on rice growth, but, less loss of ( ̄(15)NH4)2SO4-N was observed in the soil with a longer period of pre-flooding.
- Series:
(D) Agriculture
- Subject:
Crop
- Classification Code:
S511
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