Effects of different nitrogen forms on yield and nitrogen accumulation of early maturing potato
The cultivation area of early-maturing potato in the double cropping area of Hebei province was gradually increasing.It was of great significance for the development of early-maturing potato industry in Hebei province to clarify the growth characteristics and nutrient absorption and utilization of early-maturing potato under the current nitrogen input level.A comprehensive evaluation of potato dry matter accumulation,nitrogen uptake and accumulation and potato yield under different nitrogen forms(ammonium nitrogen,nitrate nitrogen and amide nitrogen,remarking as NF1,NF2 and NF3,respectively)was carried out with early maturing potato cultivar Shishu 1 as test material.The results showed that the dry matter accumulation of early-maturing potatoes in each treatment was consistent with the logistic growth curve,and the dry matter accumulation in the whole growth period of NF1,NF2 and NF3 treatments were 16401.6,15603.6 and 16383.0 kg·hm-2,respectively.The nitrogen accumulation rate of potato in each treatment increased significantly before the budding stage,and then decreased.After entering the mature stage,the nitrogen accumulation rate of potatoes in NF3 treatment increased significantly,reaching 5.53 kg·hm-2·d-1.The nitrogen accumulation of NF3 in the mature period was significantly higher than that in NF2 and CK treatments,and there was no significant difference compared to NF1 treatment.The nitrogen utilization rate of potatoes in NF3 treatment was 39.69％,and it was significantly higher than that in NF1 and NF2 treatment,and its agronomic efficiency was 52.67 kg·kg-1 which was significantly higher than that in NF2 treatment.The yield of commercial potato in NF3 treatment was 56688 kg·hm-2,which was significantly higher than that in other treatments,and the total yield was 59460 kg·hm-2,which was significantly higher than that in control without nitrogen fertilizer and NF2 treatment.In conclusion,under the nitrogen input level of potato in the double cropping area of Hebei province,applying amide nitrogen had the most significant effect on the nitrogen uptake and accumulation of potato and the formation of commercial yield,which was the optimal treatment under the experimental conditions.
different nitrogen formsearly maturing potatodry matter accumulationnitrogen accumulationproduction
万方数据
维普
