1. 2017-02-15 This article is from ECHO Asia Note #30 [编者注:Peter是一个在泰国清迈自由顾问,他是德国莱比锡的农业硕士。Peter是“山地项目(Upland program)”的前研究员,这是一个霍恩海姆大学(德国) 和清迈大学(泰国)的合作项目。他的联系方式是:peter.elstner@gmx.net 我们一直在寻找一个关于东南亚土壤的参考指南。过去不得不依靠很多东南亚国家 提供的土壤样本碎片, 这些指南数据多数比较陈旧,当然也没有互动。在这篇 文章中,Peter Elstner 研究了数字土壤地图,得出东南 亚7个主要土壤种类的结 论。...
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    2009-01-20 All plants need certain mineral elements for proper growth, development, and maintenance. The basic structure of all organisms is built of carbon (C), oxygen (O) and hydrogen (H). Plants obtain these elements from water (H2O) in the soil and carbon dioxide (CO2) in the air, so no input is...
  3. 2019-10-01 Acidic soils are soils with a pH lower than 7. For most plants, having a pH between 6 and 7.5 is ideal (see table 1 for more exact numbers), but soils can become dangerous when their pH drops beneath 4.5. As the pH drops, aluminum becomes more soluble, toxifying the soil and harming the plants....
  4. 1984-01-01 Excessive soil acidity is a continuing problem in many agricultural areas and is increasingly becoming a yield-limiting factor in other areas. The pH of soils of the dryland wheat-growing area of the Pacific Northwest has dropped an average of one unit in the last 20 years. Similar effects are...
  5. 2004-04-20 Terra preta is very productive soil with long-lasting fertility—unusual in the tropics, where most soils are very weathered, highly acidic, and low in organic matter and essential nutrients. The key to terra preta soils long-term fertility seems to be charcoal; terra preta contains up to 70 times...
  6. ABSTRACT - Journal of Composting Science and Utilization, 2017 Tropical acid soils are highly weathered as they exist under tropical environment with high rainfall and temperature throughout the year, which affects nitrogen availability. Soil organic nitrogen is important in estimating soil...
  7. 2001-04-20 Soil acidity, or low pH, limits plant growth in many parts of the world. Although low pH can harm plants in many ways, this article will deal only with one of these factors, aluminum (Al) toxicity.Al is the third most abundant element on the earth (after oxygen and silicon), and the most abundant...
  8. 2002-01-20 The conventional view of the relationship between soil nutrients and crop productivity in the tropics is leading to both damaging agricultural policies and inefficient and damaging farm-level practices. There is no need to use the huge quantities of chemical fertilizers that are so often...