Effects of Soluble Ammonium Polyphosphate Fertilizer on Yield,Quality,Nitrogen Uptake and Nitrogen Utilization of Tomato in a Plastic Greenhouse

To clarify the suitable application rate of the soluble ammonium polyphosphate fertilizer for tomato,the nitrogen( N) rates of soluble ammonium polyphosphate fertilizer on yield,quality,N uptake and distribution,N balance and N utilization efficiency of autumn-winter tomato were studied in a plastic greenhouse. The results showed that the yield of tomato was the highest at 137. 8 kg / ha and the fruit weight was the highest at 116 kg / ha.The most appropriate N rate for tomato quality was 116 kg / ha. As the N uptake of tomato roots and stems,the difference between treatments was not significant; the most appropriate nitrogen rate for tomato fruit and whole-plant were71. 39,84. 39 kg / ha respectively. The nitrogen utilization efficiency( NUE) was higher than other treatments at 116 kg / ha. For this treatment,the apparent loss of nitrogen was 113. 75 kg / ha. In summary,the most appropriate nitrogen rate for a higher autumn-winter tomato yield was at 116 kg / ha and the NUE was 27. 6% under this soil fertility.