Kan patthana technology kan chai pui kap khaophot nai rai kasettakon Chang Wat Nakhon Sawan.
1988
Chollawuth La ied | Withaya Masangsan | Sompong Ditsantea
Trial results for 1987 indicate that in "black soil", of the Ta Khli series (Typic Calciustolls), there is no signficant yield response to the application of phosphate. In these soils, the most profitable nitrogen dose was found to be 10 kg./rai N. A single-nutrient source of nitrogen (urea) was used in this trial, not compound fertilizer. In "red soils", of the Pak Chong series (Oxic Paleustults), a significant yield response was found to the application of both nitrogen and phosphate. Furthermore, a significant nitrogen by phosphate interaction was found. In these soils, the most profitable dose of nutrients was found to be 10 kg./rai of nitrogen and 5 kg./rai of phosphate. Regarding timing of application, clear differences were not found among treatments with respect to the effect of timing on maize yield. The application of all nitrogen and phosphate at planting time, seems to result in a significantly lower yield than the alternative treatments (late application and various kinds of split applications). This may be due, however, to distortions caused by a replanting.
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