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Fertilization of SRC Willow, I: Biomass Production Response

机译：SRC杨柳的施肥，I：生物量生产响应

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Short rotation coppice (SRC) willow is often regarded as one of the most promising crops to increase biomass production and thereby meet the growing demand for renewable energy. This study is based on the hypotheses that biomass production of SRC willow responds positively to increasing doses of nitrogen, and that similar biomass production response can be achieved by use of mineral fertilizer, sewage sludge and animal manure. A 2-year experiment was established with the clone Tordis grown on a sandy soil in northern Jutland, Denmark. The experiment included mineral fertilizer, sludge and manure, and treatments of different doses up to 360 kg nitrogen ha−1. The fertilization led to a modest but significant increase in biomass production. The largest production of 11.9 oven dried tons/ha/year was obtained for the application of 60 kg nitrogen ha−1 annually. Higher doses did not lead to increased biomass production; in fact, production seemed to decline with increasing fertilization application (not significant). We found no difference in production between different types of fertilizers. The limited response of the fertilization may be caused by a high fertility of the soil due to former agricultural fertilization. The number of sagging shoots increased significantly with increasing nitrogen dose.
机译：短轮公墓（SRC）柳树通常被认为是增加生物量产量从而满足对可再生能源不断增长的需求的最有前途的作物之一。这项研究基于以下假设：SRC柳树的生物量生产对氮的剂量增加呈正向响应，并且通过使用矿物肥料，污水污泥和动物粪便可以实现类似的生物量生产响应。建立了一个为期2年的实验，克隆的Tordis生长在丹麦日德兰半岛北部的沙质土壤上。该实验包括矿物肥料，污泥和肥料，以及不同剂量的处理，最高处理量为360 kg氮ha-1。施肥导致生物量产量适度但显着增加。每年施用60 kg氮ha-1可获得最大产量11.9烘箱干燥吨/公顷/年。更高的剂量并没有增加生物量的产生；实际上，产量似乎随着施肥量的增加而下降（不明显）。我们发现不同类型肥料之间的产量没有差异。施肥的有限响应可能是由于以前的农业施肥导致土壤的高肥力引起的。下垂芽的数量随着氮剂量的增加而显着增加。

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