STUDY ON THE INFLUENCE OF THREE NUTRIENT COMPOUND FERTILIZER ON THE YIELD AND QUALITY OF LETTUCE
Huang Yun (Resources and Environment College, Southwest Agricultural University, Chongqing 400716) Rao Zhihong (Science and Technology Department, Agriculture Ministry, Beijing 100026) Wang Enzhi (Resources and Environment College, Southwest Ag
In a pot experiment, the effects of potassium ammonium di hydrogen phosphate on the yield and quality of lettuce were studied. In a reasonable range of fertilization rate, the total amount of nutrient uptake by the plants increased with the compound fertilizer applied. The N and K uptake increased most conspicuously, by as much as 56.52% and 54.79%, respectively. P uptake increased by only 1.90%. Excessive fertilizer application retarded the obsorption of the nutrients, however. The nutrients taken up by the plants were mainly distributed in the stem and the leaves, accounting for 92.57%～95.8%, 89.03%～93.64% and 90.47%～95.54% of total N, P and K, respectively. The greater plant growth was, the lower the percentage of nutrients contained in the root would be. Advantage was shown for the compound fertilizer in their nutrient supplying capacity, nutrient availability and fertilizer efficieny as compared to the equivalent of single nutrient N, P and K fertilizers.
【CateGory Index】： S158.3