Burning vs Incorporation of Rice Crop Residues1

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Abstract
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.

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