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ห้องสมุดกรมพัฒนาที่ดิน

Abstract

The effect of crop residue management, combined with application of chemical

fertilizer, on rice (RD-MAEJO2) yield response, soil properties and economic return was
investigated in Baan Nam Lork, Bor Thong sub-district, Thong Sean Khan district, Uttaradit
province. The experiment was carried out in Renu soil series, soil group no. 17, from October
2013 to September 2016. The experimental design was a randomized complete block of 9
treatments with 3 replicaions. The treatments included farmer’s management (N=21.4

P O =4.0 and K O=0 kg/rai) with no soil conditioners, chemical fertilizer based on soil test
2 5
2
(N=12.0 P O =8.0 and K O=6.0 kg/rai), corn cob charcoal at rate of 100, 300 and 500 kg/rai
2 5
2
combined with chemical fertilizer based on soil test, rice husk charcoal at rate of 100, 300
and 500 kg/rai combined with chemical fertilizer based on soil test, and 300 kg/rai of cow
dung combined with chemical fertilizer based on soil test. The results showed that there
were no significant differences in soil pH, organic matter, available phosphorus, extractable
potassium, yield components such as number of tillers, spikes per plants, grain per spike and

its dry weight, and tillers’ height, among treatments. However, application of rice husk
charcoal with chemical fertilizer provided 1,038.8 kg/rai of rice yield production, which was
greater than the yield response to farmer’s management, while farmer’s management
provided greater economic return of 15.58 baht/rai. This is due to there was no cost of crop

residue management for soil improvement, resulting in farmer’s management provided the
best economic return with the B/C ratio of 2.61.