By Meine van Noordwijk, Georg Cadisch, Chin K Ong
This e-book presents a synthesis of plant-soil-plant interactions from the plot to panorama scale. It makes a speciality of the method point, that is suitable to many sorts of multispecies agroecosystems (agroforestry, intercropping and others). It additionally hyperlinks easy study to useful software (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 matters. The contents contain root structure and dynamics, plant-soil biota interactions, soil biodiversity and meals webs, water and nutrient biking, and the required 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
Ong et al. ) TA > 0 TA > 0 TB < 0 TB < 0 If I changes in sign I increases TA < 0 TB > 0 a positive I becomes negative a negative I becomes positive a positive I becomes negative a negative I becomes positive TA < 0 TA > 0 TB < 0 TB > 0 TA refers to the net effect on changed resource; TB to that of another limiting resource. ‡ Both statements may be true. However, if I is negative, the statement with the negative T value is most meaningful; if I is positive, the one with the positive T value is most meaningful.
Others (such as Imperata cylindrica) are thought to be disadvantageous because they promote ‘hot soil’ (din ron) (Preechapanya, 1996). Jungle rubber farmers in Jambi province (Indonesia), classify soil as tanah panas (‘hot soil’) and tanah dingin (‘cool soil’). , 2003). , 2000b). Farmers associate the faster heating of tanah panas soils with their higher sand content. These soils are also known to be highly porous, and consequently to suffer more pronounced nutrient leaching. Tanah dingin soils, on the other hand, contain more organic matter and less sand: they remain relatively cool and are considered better soils for plant growth.
So, for example, land that was good for cocoa was not good for rice, whereas land that was described as fertile in relation to maize cultivation was not considered adequate for cocoa. 2. Terminology used to describe soil fertility by farmers in five villages in the forest, transition and savannah zones of Ghana. Twi words are italicized. ) Local term Literal meaning Explanation Ahoõden Seradee¯ Aduane Asaase õkyene adee¯ ‘Strength’/‘power’ ‘Fat’ ‘Food’ ‘Land that helps things’ Asaase a enyine Asaase shesheshe Enyunu ‘Land that is mature or well grown’ ‘Hot land’ ‘Cool’ Fertility Fertility Soil nutrients Land that is good for crop growth/fertile (used only at Oda) Fertile soil found after a long fallow Characteristic of infertile soil Characteristic of fertile soil ● it has a high organic matter content, derived from the decomposition of a lot of vegetation; ● it is ‘cool’, even when the sun is shining on it; ● it is soft and friable, to the extent that a knife would easily penetrate it to some depth; and ● it harbours few weeds during the cropping phase, so that less weeding is required.