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| 1 | Effect of N and K Fertilizers on Yield and Quality of Greenhouse Vegetable Crops显示文摘The application of large amounts of fertilizers, a conventional practice in northern China for the production of vegetable crops, generally leads to substantial accumulation of soil nutrients within a relatively short period of time. A fixed field experiment was designed to study the effects of nitrogen (N) and potassium (K) fertilizers applied to optimize the yield and quality of typical vegetable crops. Application of N and K fertilizers significantly increased the yields of kidney bean. The largest yields were obtained in the first and second years after application of 1500 kg N and 300 kg K2O ha-1. In the third year, however, there was a general decline in yields. Maximum yields occurred when intermediate rates of N and K (750 kg N and 300 kg K2O ha-1) were applied. However, no significant differences were observed in the concentrations of vitamin C (VC) in kidney bean among different years and various rates of fertilizer treatments. Yields of tomato grown in rotation after kidney bean showed significant responses to the application of N and K in the first year. In the second year, the yields of tomato were much lower. This suggested that the application of N fertilizer did not have any effect upon tomato yield, whereas application of K fertilizer did increase the yield. Application of K fertilizer was often associated with increased sugar concentrations. | LIU Zhao-Hui JIANG Li-Hua LI Xiao-Lin R. HARDTER ZHANG Wen-Jun ZHANG Yu-Lan ZHENG Dong-Feng | 2008 | Pedosphere2008，18，4： | 14 |
| 2 | 钾肥用量和品种对桑叶生产及蚕茧质量的影响显示文摘通过为期 4年的田间施肥试验和 1季养蚕试验 ,研究了钾肥用量和钾肥品种对桑叶产量、品质、养分吸收和蚕茧质量的影响。结果表明 ,施K2 O 1 5 0、30 0、375kghm-2 a-1 处理分别比不施K肥年均增产桑叶 2 3.9%、31 .7%、36 .0 %;等量钾肥时 ,KCl对桑叶增产效果基本等同于K2 SO4;施钾增产效果有逐年增加趋势 ,同时钾肥施用表现后效。施钾明显提高桑叶中N、K和S(K2 SO4为钾源时 )含量 ,而降低Ca、Mg和Zn含量 ,对P含量影响不大。结果显示 ,钾肥施用大幅度促进了桑树对各种养分的吸收 ,从而提高了肥料利用率。施钾明显促进桑叶品质的改善 ,随着钾肥用量增加 ,桑叶中必需氨基酸、氨基酸总量、蛋白质、糖分和油脂含量均呈增加趋势。KCl施用也能提高桑叶品质 ,但效果比K2 SO4差。蚕茧质量测试结果表明 ,桑树施钾后对喂养的蚕茧品质产生正面影响 ,蚕重、全茧量、上茧率、茧丝长、解舒率、茧丝净度等指标均因施钾而提高 ,高量钾比低量钾效果好 ,在等量钾用量时K2 SO4对蚕茧质量的促进作用明显好于KCl。 | 鲁剑巍 陈防 万运帆 吴恢 刘冬碧 Rolf Hardter | 2004 | 土壤学报2004，41，5： | 9 |
| 3 | Effect of root zone pH and form and concentration of nitrogen on accumulation of quality - related components in green tea 显示文摘 | Ruan J Y Gerend~ J Hardter R | 2007 | Journal of the Science of Food and Agriculture2007，87，： | 1 |
| 4 | Effects of potassium and magnesium nutrition on the quality components of different types of tea显示文摘 | Ruan J Wu X Hardter R | 1999 | Journal of the Science of Food and Agricuhure1999，79，1： | 1 |
| 5 | CABI Soils and Fertilizers,显示文摘 | Ji Hardter R | 2000 | 63(7)2000，722，： | 1 |
| 6 | Effect of nitrogen form and root-zone pH on growth and nitrogen uptake of tea ( Camellia sinensis) plants 显示文摘 | Ruan J Gerendas J Hardter R | 2007 | Ann Bot2007，99，2： | 1 |
| 7 | Effects of potassium and mag- nesium nutrition on quality components of different types of tea显示文摘 | Ruan J Wu X Hardter R | 1999 | J Sci Food Agri1999，，79： | 1 |
| 8 | Effect of ni trogen form and root-zone pH on growth and nitrogen uptake of tea(Camellia sinensis)plants显示文摘 | Ruan J Y Gerendas J Hardter R | | 0，，： | 1 |
| 9 | Effect of nitrogen form and root-zone pH on growth and nitrogen uptake of tea (Camellia sinensis) plants显示文摘 | Ruan J Y Gerendas J Hardter R | 2007 | Ann Bot2007，99，2： | 1 |
| 10 | Plant nutrition and fertilization of vegetables for yield and quality显示文摘 | Hardter R | 1997 | Agro Chemicals News in Blief1997，20，1： | 1 |
| 11 | Effect of nitrogen form and root-zone ph on growth and nitrogen uptake of tea (Camellia sinensis) plants 显示文摘 | Ruan J Y Gerendas J Hardter R | 2007 | Annals of Botany2007，99，2： | 1 |
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