硫酸銨、氯化銨、硝酸銨與尿素對流水稻之肥效比較地方試驗 第二年（一九五三年）

Abstract

This experiment was carried out in order to compare the availability of Ammonium Sulphate, Ammonium Chloride, Ammonium Nitrate and Urea on the yield of rice. The experiment was carried out for two crops in ten localities, namely, Lotung, Taipei, Hsinchu1 Miaoli, Taichung, Yuanlin, Chiayi, Tainan, Fengshan, and Pingtung, The amount of nitrogen were devided .in four levels, namely, 0, 40, 80, 120 kg/ha. Fertilizers and quantities were combined to make 16 treatments which include 4 assumed treatments, then the actual treatments were 13. In Taipei, Hsinchu and Taichung the split plot design was adopted and randomized black design in others. The results according to statistical analysis may be concluded as follows: 1. The effect of the quantity of fertilizer is significant both in grain and straw. In the first crop, the yield was increased with the amount of fertilizer. In the second crop, however, the difference between the two treatments of 80 kg/ha and 120 kg/ha is not significant. 2. The increased amount of yield per kilogram of nitrogen is greatly affected by the amount of fertilizer, the kind of fertilizer and the locality. The increased amounts per kilogram of nitrogen at the level of 80 kg/ha are as follows: (The form is abbreviated) In general the yields in first crops are higher than those of second crop. The increased amounts of yield per kilogram of nitrogen in the first crop are about 1^1/2 times as much as those in second crop or even more. 3. As for the fertilizer effects on the yields of grain, we find no significant difference between Ammonium Sulphate and Ammonium Chloride. Of straw, however, Ammonium Chloride seems to give a better effect than Ammonium Sulphate, especially in the second crop. 4. Either Ammonium Sulphate or Ammonium Chloride gives a better effect than Urea, but each of them including Urea exceeds Ammonium Nitrate, especially in the first crop the difference were more significant than in the second crop. 5. In the region of lateritic soil, those except Ammonium Sulphate do not actually incerase the yield in the second crop.