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| 1 | Mineral Coated Fertilizer Effect on Nitrogen-Use Efficiency and Yield of Wheat显示文摘A field experiment with winter wheat (Triticum aestivum L.) was conducted on a silt loam calcaric endorusti-ustic Cambosols derived from the Yellow River alluvial deposits in Henan, China, from 2001 to 2002 to evaluate N recovery and agronomic performance of different mineral coated fertilizers (MiCFs) compared to normal urea used in wheat cropping systems under field conditions. Five treatments, including CK (check, no N fertilizer), urea and three different MiCFs at an equivalent N application rate were established in a randomized complete block design. N release from MiCFs in soil was more synchronous with the N requirement of wheat throughout the growth stages than that from urea, with grain yield of the MiCF treatments significantly higher (P < 0.05) than that of the treatment urea. Correspondingly, the N recovery rate was greater for all MiCFs compared to urea, increasing from 32.8% up to 50.1%. Due to its high recovery and low cost, use of the mineral coated N fertilizers was recommended instead of the polymer coated N fertilizers. | LI Jian-Yun HUA Quan-Xian TAN Jin-Fang ZHOU Jian-Min HOU Yan-Lin | 2005 | Pedosphere2005，15，4： | 21 |
| 2 | Soil Organic Nitrogen and Its Contribution to Crop Production显示文摘Plant growth and crop production depend to a large extent on soil N supplying capacity(SNSC):The higher the SNSC,the higher the dependence of crops on soil and the lower the N fertilizer recovery.Of the SNSC,soil organic N(ON)played a key role in supplying N nutrient to crop production and still does in many subsistence and low-input farming systems.In this paper,soil ON contents,types,chemical components and its contribution to plant production are reviewed up to date in details,the characteristics of ON in dryland soils discussed together with its chemical components,and the mineralization and availability to plants of some important chemical components are emphasized at the last part for practical considerations. | LI Sheng-xiu WANG Zhao-hui MIAO Yan-fang LI Shi-qing | 2014 | Journal of Integrative Agriculture2014，13，10： | 16 |
| 3 | 东北黑土有机磷的矿化过程研究显示文摘用室内恒温控湿培养法和埋袋法研究了不同时间序列下黑土有机磷的矿化过程.结果表明,无论是实验室培养法还是埋袋法,有机磷含量和矿化速率都逐渐下降,累积矿化率逐渐上升.培养法中,两个处理的矿化速率均在1个月时最大,分别为31.67和38.75mg·kg-1·month-1,6个月时累积矿化率和矿化速率分别为7.94%,13.26mg·kg-1·month-1;9.24%,17.99mg·kg-1·month-1.埋袋法中,5个有机物料处理的矿化速率均在1年时最大,分别为55.67、55.65、49.60、19.71和22.52mg·kg-1·month-1,3年时玉米根和小麦根处理的累积矿化率和矿化速率较高(二者3年的累积矿化率约50%,矿化速率约35mg·kg-1·month-1),而大豆根和草根的处理则较低.同时,两种研究方法均表明,有机磷初始含量影响其矿化率和矿化速率,有机磷初始含量愈高,其矿化率和矿化速率就愈高. | 赵少华 宇万太 张璐 沈善敏 | 2005 | 应用生态学报2005，16，10： | 14 |
| 4 | 水稻冠层光谱反射特征及其与叶面积指数关系研究显示文摘在水稻试验小区,通过人为控制的方法造成施N水平的差异,对水稻整个生长期内冠层光谱进行了比较系统、密集的测定,并测定了水稻几个重要生育期的叶面积指数.结果表明:随着施N水平的提高,水稻冠层光谱在各生育期呈现出一定的规律性,在近红外部分(760~1220nm),冠层光谱反射率随着施N水平的提高而升高,而在可见光部分(460~710 nm),水稻冠层的光谱反射率反而逐渐降低.冠层光谱经差异显著性检验发现:水稻灌浆期以前,对施N水平最为敏感的波段是绿光(560~610 nm)和近红外(710~760 nm)部分;转换为归一化植被指数(NDVI)以后,差异最显著的是(R760-R560)/(R760+R560).对叶面积指数与冠层光谱反射率的相关分析结果表明:在水稻抽穗期以前,叶面积与冠层光谱反射率相关性较差;而抽穗期以后,二者有较好的相关性. | 吕雄杰 潘剑君 张佳宝 | 2004 | 土壤2004，36，6： | 9 |
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