Khun kha thang setthakit khong kan chai pun marl kap pui khemi kap kan chai pui insi phosphate ruam kap pui khemi to kan pluk khao nai din prieo chat.
1986
Boonthong Tantisira | Nakorn Thawornwong | Srichai Niratiam
Field experiments were conducted in three series of acid sulfate soils which varied in soil acidity and land suitability classes for paddy, namely Maha Phot (class P-IIa), Rangsit (class P-IIIa) and Rangsit-very acid phase (class P-IVa). The experiments were selected at three different locations. To increase rice production and to maximize the net profit, improvement of acid sulfate soils by liming and fertilizer application was studied. In the moderately acid sulfate soil, Maha Phot series, the application of ammonium phosphate (16-20-0) at the rate of 30 kg. per rai and top dressing with ammonium sulfate at the rate of 15 kg. per rai could be enough to increase rice yield and to maximize the net profit. In the severely acid sulfate soil, Rangsit series, marling had little effect on rice yield. The basal application of complete fertilizer (12-3-6) at the rate of 40 kg. per rai or ammonium phosphate (16-20-0) at the rate of 30 kg. per rai and top dressing with ammonium sulfate at 15 kg. per rai could be enough to increase rice production and to maximize the net profit. In the extremely acid Rangsit-very acid phase, liming is necessary to correct the soil pH. Applying 4 tons per rai of marl with ammonium phosphate (16-20-0) gave the highest yield response. The maximum profit obtained from the treatment of marl at 2 tons per rai with 30 kg. per rai of ammonium phosphate.
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