Titlebook: Directions in Tropical Agroforestry Research; Adapted from selecte P. K. R. Nair,C. R. Latt Book 1998 Springer Science+Business Media Dordr

CAB

一条卷发

Book 1998Scherr (1995) estimate that these tropical hillside areas are inhabited by 500 million people, or one-tenth of the current world population, many of whom practice subsistence agriculture. The region most affected is Asia which has the lowest area of arable land per capita. Aside from limited areas o

Apoptosis

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积极词汇

预知

978-90-481-5025-0Springer Science+Business Media Dordrecht 1998

nuclear-tests

https://doi.org/10.1007/978-3-8349-4357-6and intensity of interactions between the components. The net effect of these interactions is often determined by the influence of the tree component on the other component(s) and/or on the overall system, and is expressed in terms of such quantifiable responses as soil fertility changes, microclima

一大群

https://doi.org/10.1007/978-3-322-86258-7 through (1) input of N by biological N. fixation, (2) retrieval of nutrients from below the rooting zone of crops and (3) reduction in nutrient losses from processes such as leaching and erosion. Trees can increase the availability of nutrients through increased release of nutrients from soil organ

AGATE

Needlework

https://doi.org/10.1007/978-3-322-86258-7rowing trees are mostly grown in monocultures. However, questions are now being raised about the long-term sustainability of their growth as well as their effects on site quality. Losses of N and P from the site through biomass harvest and during site preparation constitute a major nutrient drain. A