Nutrient Absorption,Yield and Quality of Solanum tuberosum L. under Different Nitrogen Levels

In order to study the effects of different nitrogen levels on nutrient absorption, yield and quality of Solanum tuberosum L., field experiments were conducted under four treatments of nitrogen rate of N1(CK) 0 kg / hm2,N2 75 kg / hm2, N3 105 kg / hm2,N4 135 kg / hm2with randomized block design and three repeats. The results showed that dry matter accumulation increased with increasing nitrogen in the tuber formation. Aboveground dry matter accumulation of N4 treatment was 4 279.01 kg / hm2, increasing by 61.67% compared with the control. N4 treatment can significantly promote the potato nutrient absorption. NPK uptaking were increased 84.80%,79.28% and 173.27%. Compared with the control,production of N2 to N4 treatment increased 21.85%、22.22%、24.44% with no significant difference from the control. Tuber starch content of N4 treatment was higher than that of the control. Comprehensive analysis suggests that potato nitrogen rate of 135 kg / hm2is appropriate.