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对种植在泰国西部的无刺卡因菠萝(Smooth Cayenne)进行试验,施氮水平为0—120kg/rai(1kg/rai=0.16kg/ha),菠萝的生长和产量都随氮水平的增加而增加,氮的最适比率在72—96kgN/rai 的范围内,菠萝产量为13.5—14.4吨/rai。在催育阶段,叶片氮最适水平在1.4—1.8%的范围内。氮水平增加会使叶片的磷、钾、钙和镁含量下降,氮水平对果重与株重比率没有明显影响。
Nitrogen levels were 0-120 kg / rai (1 kg / rai = 0.16 kg / ha) for both cultivars of Smooth Cayenne grown in western Thailand. The growth and yield of pineapple increased with increasing nitrogen levels Increase, the optimum nitrogen ratio in the range of 72-96kgN / rai, pineapple yield of 13.5-14.4 tons / rai. In the breeding stage, the optimum level of leaf nitrogen was in the range of 1.4-1.8%. The increase of nitrogen level decreased the content of phosphorus, potassium, calcium and magnesium in leaves, and the nitrogen level had no obvious effect on the ratio of fruit weight and plant weight.