Soil Fertility evaluation and fertilization [potassium, nitrogen and phosphate] for the improvement of mulberry yield and leaf quality [at Kasetsart University, Kampangsaen Campus, Nakhon Pathom Province (Thailand)]
Yongyoot Osotsapa | Suphap Booranakarn (Kasetsart Univ., Bangkok (Thailand). Faculty of Agriculture. Dept. of Soil Science)
This experiment was conducted to study the effects of nitrogen and phosphorus fertilizer levels on growth and yield of mulberry. Four levels each of nitrogen and phosphorus fertilizers were used in this experiment as follows: 0, 12, 24, 36 kg N/rai and 0, 12, 24 36 kg/P205/rai. They were arranged into 16 fertilizer combintions as follows: 0-0, 12-0, 24-0, 36-0, 0-12, 12-12, 24-12,36-12, 0-24, 12-24, 24-24, 36-24, 0-36, 12-36, 24-36 and 36-36 kg N-P205 per rai. Potassium fertilizer was applied equally at the rate of 12 kg K20/rai. The one-year old mulberry plants were used in this experiment and the fertilizers were applied 2 weeks after shoot cutting. The application of nitrogen and phosphorus fertilizers resulted in higher number, length of branches and fresh weight of leaves than th eone-fertilized plots. Increasing the nitrogen level from 12 to 24 kg N/rai produced higher fresh weight of leaves as well as number and length of branches. Further increaing nitrogen levels, however, did not show any marked differences in mulberry growth. The effect of phosphorus fertilizer on mulberry production was also promising. The rate of 24 kg P205/rai produced higher number of branches and fresh weight of leaves than 12 kg P205/rai. Application of the highest phosphorus level did not increase mulberry growth and fresh leaves production. Under this conditions, 24 kg N and 24 kg P205 per rai was suitable for mulberry production
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