Kan suksa amnat nai kan hai potassium kae khaophot khong din Chuntuk, din Hinkong din Manorom din Pakchong din Tha Muang lae din Tha Tako.
1981
Panpimon Chunyanuwat
Potassium supplying power of six soils representing six soil series commonly used for corn growing were studied with continuous cropping in pot experiment. The experiment was conducted in Randomized Complete Block design with 4 replications. Potassium fertilizer was applied at the rates equivalent to 0, 18, 36 and 54 kg. K/rai. Corn plants from each harvest were analysed for K content by N HCl extraction. The soil samples collected before and after each cropping were analysed for potassium by methods employing NH40Ac extraction and H - saturated resin extraction. "Excess K", i.e., the amount of K that can be released to crop before response to K -fertilizer can be obtained, are 0.00, 0.00, 0.00, 0.687, 0.408 and 0.00 me K/100 g. soil for Chun Tuk, Hin Kong, Manorom, Pak Chong, Tha Muang and Tha Tako soils, respectively. These values indicate that Chun Tuk, Hin Kong Manorom and Tha Tako soils require potash fertilizer for high yield production, whereas the rest of the soil do not. It has also been predicted that response of corn to potash fertilizer is not likely to be obtained within the next 33 croppings for Pak Chong soil and croppings for Tha Muang soil.
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