燥红土不同土地利用类型土壤侵蚀特征——以云南小江流域为例

云南小江流域土壤侵蚀十分严重，为揭示其侵蚀机理及探索有效治理方法，对其典型土壤——燥红土不同土地利用类型开展了人工降雨产流产沙试验，并运用水分测定仪（TRASE 6050X1 TDR）对土壤水分变化进行动态监测。结果表明：灌草地蓄水拦沙能力最强，坡耕地（坡式梯地沿等高线开挖垄沟种植花生）次之，裸坡地最弱；同种利用类型土壤不同土层传输水分和吸收水分能力不同；在较大雨强（0．61mm／min）且充足降雨条件下，小江流域燥红土地表产流特征经历了以超渗产流为主、超渗产流和饱和产流同时进行、以饱和产流为主的3个阶段。     

氮肥对磷在红壤肥域微域中迁移和转化的影响

The effects of two different nitrogen fertilizers （urea and NH4C1） with monocalcium phosphate （MCP） on the movement and transformation of fertilizer P in soil microsites along with soil pH changes at different distances from the fertilizer application site were studied in an incubation experiment. A highly acidic red soil （Ultisol, pH 4.57） from south China with MCP fertilizer alone or in combination with NH4C1 or urea was added to the surface of soil cylinders and packed in wax blocks. After 7 and 28 days, the extraction and analysis of each 2 mm layer from the interface of the soil and fertilizer showed that added NH4C1 or urea did not change the movement distance of fertilizer P. However, P transformation was significantly affected （P 〈 0.05）. After 7 days, at 0-8 mm distance from the fertilizer site the addition of urea significantly decreased the water-extractable P concentration; however, after 28 days the effect of N addition had disappeared. Also,at limited distances close to the fertilizer site NH4Cl application with MCP significantly increased acid-extractable P and available P, while with the addition of urea they significantly decreased. Compared with application of MCP alone,addition of urea significantly increased soil pH in fertilizer microsites, whereas the addition of NH4Cl significantly decreased soil pH.     

可溶性有机物对土壤中绿麦隆吸附与解吸的影响

A batch equilibrium techniques was used to examine the effect of dissolved organic matter （DOM） extracted from both non-treated sludge （NTS） and heat-expanded sludge （HES） on the sorption and desorption of chlorotoluron （3-（3-chloro-p-tolyl）-1,1-dimethylurea） in two types of soils, a yellow fluvo-aquic and a red soil from China. Without DOM,sorption of chlorotoluron was significantly greater （P 〈 0.05） in the red soil than in the yellow fluvo-aquic soil. However,with DOM the effect was dependent on the soil type and nature of DOM. Chlorotoluron sorption was lower in the yellow fluvo-aquic soil than in the red soil, suggesting that with the same DOM levels the yellow fluvo-aquic soil had a lower sorption capacity for this herbicide. Application of DOM from both NTS and HES led to a general decrease in sorption to the soils and an increase in desorption from the soils. Desorption of chlorotoluron also significantly increased （P 〈 0.05） with an increase in the DOM concentration. Additionally, for sorption and desorption, at each DOM treatment level the NTS treatments were significantly lower （P 〈 0.05） than the HES treatments. This implied that non-treated sludge had a greater effect on the sorption and desorption of chlorotoluron than heat-expanded sludge.     

蔗叶还田配施化肥在赤红土蔗地上的效应研究

采用正交试验设计，研究蔗叶还田配施化肥在赤红土上的改土培肥和增产效果，试验表明，蔗叶还田结合增施化肥能加速有机质的积累，改善赤红土的物理性状，增加土壤有效磷和有效钾的供应，促进甘蔗生长，提高甘蔗产量。     

移栽期对红土晒烟生长发育和产质量的影响

为探索红土晒烟适宜的种植期和收获期,初步了解红土晒烟适宜的气候环境,设置不同的移栽时间,通过比较不同移栽期烟株的生长发育情况和产量、品质表现,结果表明,不同移栽期对红土晒烟的生长速度、生育期、产量、产值、内在化学成分以及香气品质都有影响。通过调整不同移栽时间,可以使烟株生长发育在较适宜的气候条件下,使其特点得以充分展现,从而为生产优质红土晒烟营造良好客观条件。试验认为在云南保山潞江坝的自然气候环境下,选择在1月上旬移栽,烟株大田生育期适中,烟叶成熟时间较集中,利于调制,不仅产量、产值高,香气品质也表现较好。     

红土晒烟漂浮育苗技术

红土晒烟作为一种新兴产业，已成为保山市农业发展的主攻方向，仅2003年至2004年在潞江坝就进行了180hm^2以上的生产示范，且成效显著。随着种植规模的不断扩大，全市有望达到2333．33hm^2的推广种植面积。这样就对红土晒烟的高效育苗提出了新的技术要求。漂浮育苗是一项先进的育苗方式，具有生产效率高、集约化管理和规范化操作等特征。通过漂浮育苗技术育出的烟苗根系发达，生长势均匀一致，而且可在源头上有效防止病虫害的危害等优点，可大力推广。现将红土晒烟育苗技术介绍如下：     

哺乳仔猪诱食四法

<正> 1、滚筒诱食 将炒熟的香甜粒料放在一个周身有孔两端封好的滚筒内,作为玩具,让仔猪拱着滚动,拣食从筒中落到地上的粒料。 2、红土诱食 仔猪喜爱拱土,可将粒料撤在干净的红粘土上,让仔猪一边拱土,一边吃料。一是可以收到良好的补饲效果,二是可以防止仔猪缺铁性贫血。 3、以母教子 在仔猪没有补饲间     

苦恋牧歌

红土垴有两个名人,一个是神汉刘海,一个是疯婆秋梅。他两家刚好是邻居,一家是大瓦房,一家却是土窑洞。刘海精于计算,一天到晚装神弄鬼、算天算地,家境     

幻想家的天堂 影像2012

蜷缩的巨人瑞士人举起的球伯似乎有了投降的意味,但这却是温布尔登留给人们的最大假象,后面发生的事情,成为一场即使褪去色彩,也依然不会失去光环的的伟大逆转,伟大的费德勒在草地上其实并没有苦主,他负责制造着所有的答案。