By Meine van Noordwijk, Georg Cadisch, Chin K Ong
This booklet offers a synthesis of plant-soil-plant interactions from the plot to panorama scale. It makes a speciality of the method point, that's appropriate to many varieties of multispecies agroecosystems (agroforestry, intercropping and others). It additionally hyperlinks simple study to sensible program (and indigenous wisdom) in a variety of structures without or with timber, and considers implications of below-ground interactions for the surroundings and worldwide switch concerns. The contents comprise root structure and dynamics, plant-soil biota interactions, soil biodiversity and nutrition webs, water and nutrient biking, and the mandatory linkage to modelling ways. on hand In Print
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Additional info for Below-ground interactions in tropical agroecosystems: concepts and models with multiple plant components
They explain that a well-decomposed manure is soft and friable, mixes easily with soil and provides nutrients immediately, whereas undecomposed manure does Below-ground - Chap 02 21/4/04 10:15 Page 29 Locally Derived Knowledge of Soil Fertility not mix well with soil and becomes caked when dry. This causes insect pest infestation of the soil to increase. They do not, however, appear to appreciate other ameliorating effects animal manure can have on soil (such as pH buffering and the raising of its cation exchange capacity).
For present purposes, we view knowledge as: an output of learning, reasoning and perception and a basis for predictions of future events; it is people’s understanding and interpretation based on some explainable logic of supposedly general validity. This does not necessarily imply any objective notion of absolute truth, but rather a particular interpretation of information and data. Although the semantics of the terms ‘data’, ‘information’ and ‘knowledge’ are debatable, we define ‘data’ here as a recorded set of either quantitative or qualitative observations; and ‘knowledge’ as a logical interpretation or explanation of data, acquired either directly or from other sources.
Conversely, infertile soil was described in terms of: ● having a low organic matter content; ● being hard or compact; ● being infested with invasive weeds that were difficult to control; and ● producing stunted plants, which are associated with low yields. In the Ghanaian system, the key management options used to maintain soil fertility were the selection of crops appropriate to different types of land, and the use of fallows. It therefore follows that the qualities farmers associated with fertile soil were also those associated with soil on land that had been fallowed for a long time, and in which large amounts of organic matter had accumulated.