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Burning vs Incorporation of Rice Crop Residues 1
Author(s) -
Williams W. A.,
Morse M. D.,
Ruckman J. E.
Publication year - 1972
Publication title -
agronomy journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.752
H-Index - 131
eISSN - 1435-0645
pISSN - 0002-1962
DOI - 10.2134/agronj1972.00021962006400040017x
Subject(s) - straw , agronomy , vicia sativa , oryza sativa , fertilizer , crop , green manure , field experiment , yield (engineering) , mathematics , zoology , chemistry , biology , materials science , metallurgy , biochemistry , gene
The effect of burning and incorporating rice ( Oryza sativa ) straw on grain production and the N economy of the crop was evaluated over a 5‐year period in a field planted annually to ‘Colusa’ rice. An additional variable was vetch ( Vicia benghalensis ) planted in the previous autumn for green manure. The rice crop was fertilized annually at rates of 0, 45, 90, 135 kg/ha N. The amounts of straw produced ranged from 33 to 85 ql/ha (dry), and the N concentration varied from 0.42 to 0.59%, depending on the N and vetch treatments. Amounts of N incorporated in the straw or presumably volatilized by burning the straw ranged from 13 to 50 kg/ha, and N uptake measured in the grain‐plus‐straw ranged from 38 to 115 kg/ha, but burning caused no measurable decrease in the uptake of N. Highest yields were obtained from 135 N or 90 N plus vetch. Vetch had a positive effect on yield equivalent to about 45 kg/ha of fertilizer N. Five‐year averages of yields of grain show no measurable difference between burning and incorporation at any level of fertilizer or vetch N.