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水稻从发芽到幼苗期生长的 pH 最适值是4—5,所以床土应调整到这样标准,不宜超过6以上。这是育小苗的主要手段,既使是物理性好较肥沃的土壤,如pH 超过6以上时,怎样管理也不易育出好的秧苗。土壤、肥料、管理都相同,只是 pH由4—7不同条件下,秧苗试验结果,是pH 5生育最好(看干物重),其次是4和6,7的生育最差。苗高 pH 5比7高20公分,叶龄也是5生长快,叶色较浓绿,7的呈淡黄色。
The optimal value of pH for rice growth from germination to seedling growth is 4-5, so bed soil should be adjusted to such a standard, not more than 6 above. This is the main means of nursery seedlings, even if it is physically more fertile soil, such as pH over 6, how to manage is not easy to nurture good seedlings. Soil, fertilizer and management were all the same, except that the pH was varied from 4 to 7 and the seedling test results were the best for growth at pH 5 (see dry matter weight), followed by 4 and 6, 7. Seedling height 5 cm higher than pH 20 cm, leaf age is 5 fast growth, leaf color darker green, 7 pale yellow.