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首页> 外文期刊>Potato Research >Effects of nitrogen fertilizer application time on dry matter accumulation and yield of Chinese potato variety KX 13. (Special Issue: Potato production in China and Norway: plant diseases and crop physiology.)
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Effects of nitrogen fertilizer application time on dry matter accumulation and yield of Chinese potato variety KX 13. (Special Issue: Potato production in China and Norway: plant diseases and crop physiology.)

机译：氮肥施用时间对中国马铃薯KX 13品种干物质积累和产量的影响（专刊：中国和挪威的马铃薯生产：植物病害和作物生理学）。

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Application time of nitrogen (N) fertilizer can significantly influence the yield and quality of potato tubers. The objective of this experiment was to assess the effects of N application time on dry matter accumulation in foliage and tubers, as well as on marketable tuber ratio, dry matter concentration, and specific gravity of the Chinese cultivar KX 13. The four treatments were as follows: all the 150 kgNha-1 applied at planting (T1); 100 kg N ha-1 applied at planting and 50 kg N ha-1 applied 1 week before tuber initiation (20 days after emergence, DAE) (T2); 100 kg N ha-1 applied at planting and 50 kg N ha-1 applied 1 week before tuber bulking stage (35 DAE) (T3); and 100 kgNha-1 applied at emergence and 50 kg N ha-1 applied 1 week before tuber bulking stage (35 DAE) (T4). For all treatments, 90 kg P2O5 ha-1 ((NH4)2HPO4) and 150 kg K2O ha-1 (K2SO4) were applied at planting. Thirty tons per hectare of marketable tuber yield was achieved with T3, while 23 t ha-1 marketable yield was achieved by applying all 150 kg N ha-1 at planting (T1). Relative to treatment T1, T3 also significantly increased harvest index (HI) from 0.76 to 0.86 and marketable tuber ratio from 64.8% to 79.2%. Applying N at planting in conjunction with dressing at 20 DAE (T2) gave a high marketable tuber ratio (74%) and HI (0.86), but the lower total tuber yield led to a lower marketable tuber yield. Without N application at planting (T4), N dressing did not increase the yield and HI. Treatments with N dressing had no significant effect on specific gravity or dry matter concentration of tubers.Digital Object Identifier http://dx.doi.org/10.1007/s11540-012-9220-y
机译：氮肥的施用时间会显着影响马铃薯块茎的产量和质量。本实验的目的是评估施氮时间对叶片和块茎干物质积累以及对中国品种KX 13的适销块茎比率，干物质浓度和比重的影响。四种处理方法分别为如下：在播种时施用的所有150 kgNha -1 （T1）;播种前1周（出苗后20天，DAE）施用100 kg N ha -1 ，并施用50 kg N ha -1 （T2）;在块茎膨大阶段（35 DAE）之前（T3），在种植时施用100 kg N ha -1 ，并在播种前1周施用50 kg N ha -1 。在块茎膨大阶段（35 DAE）（T4）前1周施用100 kgNha -1 ，施用50 kg N ha -1 。对于所有处理，90 kg P 2 O 5 ha -1 （（NH 4 ） 2 HPO 4 ）和150千克K 2 O ha -1 （K 2 SO 4 ）。 T3使每公顷可出售块茎产量达到30吨，而在播种时施用全部150 kg N ha -1 则可达到23 t ha -1 的可销售产量（T1 ）。相对于处理T1，T3还将收成指数（HI）从0.76显着提高到了可食用的块茎比率，从64.8％提高到79.2％。在播种时施用N并与20 DAE（T2）的追肥配合使用，可获得高的块茎比率（74％）和HI（0.86），但较低的总块茎产量导致较低的块茎产量。在种植（T4）时不施用氮肥，追肥不会增加产量和HI。氮肥处理对块茎的比重或干物质浓度无明显影响。数字对象标识符http://dx.doi.org/10.1007/s11540-012-9220-y

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