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| Effects of application patterns of nitrogen fertilizeron some physio-biochemical parameters andyield of winter-planting potato |
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| Abstract: |
| Taking no nitrogen fertilizer as the control，three treatments were designed with equal amount nitrogen160 kg/hm2 to compare the effects of application patterns on some physio-biochemical parameters of winter-plantingpotato Favorita. The application patterns were as follows：100% nitrogen fertilizer was single basal application（T1），nitrogen fertilizer was split into two portions of 55% basal application and 45% seedling fertilizer（T2），nitrogenfertilizer was split into three portions of 55% basal application，30% seedling fertilizer and 15% squaring stagefertilizer（T3）. The results showed that three application methods of nitrogen fertilizer evidently improved the contentof chlorophyll，soluble sugar and soluble protein in leaves，as well as the activities of nitrate reductase in leaves，theroot activity and tuber yield. The physio-biochemical parameters of T1 were relatively higher at middle growth stageand the yield was higher than that of others. The physio-biochemical parameters were better in T3 at the latter growthstage. However there was no significant difference in the yield of three treatments. Considering from economic benefitsand field management nitrogen，T1 treatment was better choice for the winter-planting potato. |
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