Kan thotsop attra pun marl lae pui khemi phua phoem phon phalit khao nai din prieo chat sam chan khwam mosom khong din.
1986
Poonsak Paichayont | Jumpol Yuvaniyama | Charoen Charoenchamratcheep
Yield from testing plots on the rates of marl and chemical fertilizers for rice in three suitability classes of acid sulfate soils were investigated on the farmer fields in Pathum Thani, Nakhon Nayok, Prachin Buri, Chachoengsao, Chon Buri, Ayutthaya and Sara Buri provinces in 1984. The objectives of this experiment are to study on the suitable rate of marl and chemical fertilizers in every acid sulfate soil series, the residual effects of marl and the relationship between the chemical characteristics of the soils to the paddy yields. The experiment was designed as observation trial in randomized complete block with two replications. Marling rates (0, 3.12, 6.25 and 12.5 ton per ha) and two rates of ammonium phosphate (16-20-0) at the rate 125 and 250 kg per ha. were combined. Potassium chloride was applied only in Klearg Series at the rate 37.5 kg of K2O per ha. The calcium content from the analyzed soil samples were followed to the amount of applying marl especially from the surface soil samples (0-20 cm.). The amount of extractable calcium was reversed to the amount of extractable aluminum while the paddy yields were followed to the amount of extractable calcium. The response of paddy yields on Rangsit very acid soil series was highest but it was lowest in benefit. The highest benefit came from Sena/Rangsit soil series at about 3,060 Baht/ha with the rate of marl 7.0 ton/ha.
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