Farmers also planted yams have lower yields. Because of the soil, not the plants are grown. This fertilizer is a major factor that increases the yield and quality of potatoes. Fertilizer to meet the needs of yam in the rice would be the amount of manure that have put different alarm conditions farm typical and may vary in different varieties with
the introduction of the fertilizer by. The analysis is one way to improve productivity and quality, cost-effectively and do more than is necessary. Department of Agriculture Agricultural Research and Development Center Phichit. Purple sweet potato breeding beef up the package. 65-3 head-shaped oval. The head is red meat purple size of 3.5 cm long, 13.6 cm wide, head average maturity 90-110 days average yield of 2,100 kg per hectare. (Office of Research and Agricultural Development Zone 2, 2554) is a species that has the potential to compete well in the market. It looks like the market wants. Therefore, the comparison with the fertilization of the farmers with seed and fertilizer to farmers on how to perform the same. As an alternative to using the right fertilizer in the upland farmers to increase productivity have increased.
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