Effects of Trees on Soils - Spring 2002 Special Supplement on AgroForestry
ثبت نشده
چکیده
Approaches to soil management, including problems of soil degradation and low soil fertility, have recently undergone major changes. The former view was to concentrate on achieving high levels of production from the more fertile areas, leaving the marginal lands for extensive use only. Steeply sloping and highly drought-prone areas were preferably not to be cultivated at all. Soil constraints were to be overcome by inputs: improved crop varieties, fertilizers, chemical control of pests and diseases, and the use of irrigation.
منابع مشابه
Agroforestry practices, runoff, and nutrient loss: a paired watershed comparison.
A paired watershed study consisting of agroforestry (trees plus grass buffer strips), contour strips (grass buffer strips), and control treatments with a corn (Zea mays L.)-soybean [Glycine max (L.) Merr.] rotation was used to examine treatment effects on runoff, sediment, and nutrient losses. During the (1991-1997) calibration and subsequent three-year treatment periods, runoff was measured in...
متن کاملInteractions among leguminous trees, crops and weeds in a no-till alley cropping system
Trees improve the soil quality and their rapid growth in the tropics make agroforestry systems potentially effective for establishing low-input agricultural systems in this region. This study assessed the effects of the biophysical interactions among leguminous trees, weeds, cotton and maize in an alley cropping system. The experiment comprised six treatments: Clitoria + Gliricidia; Acacia ...
متن کاملChallenges of Agroforestry Systems’ Adoption by Farmers in the North Central Zone of Nigeria
AbstractThe challenges of agroforestry systems’ adoption by farmers in the North central zone of Nigeria, was carried out to address the following objectives; find out the perception of farmers on agroforestry technologies, identify the adoption level and ascertain why farmers discontinue agroforestry adoption.. Data were collected from 722 agroforestry farmers out of 782 sets of questionnaire ...
متن کاملInfluence of organic nutrients on soil quality in variable-charge soils, Pohnpei, Micronesia
Variable-charge soils of the humid tropics are frequently infertile in the extreme. In addition to low nutrient status, highly weathered subsoils may present physical and chemical barriers to roots. Limited resource farmers do not have the means to apply synthetic fertilizers but must maintain soil fertility through management of organic inputs. This work investigates differences in soil qualit...
متن کاملاثر اسید جیبرلیک، اسید نفتالین استیک، اتفن و اوره برکنترل تناوب باردهی در نارنگی رقم کینو(Citrus reticulata Blanco cv. Kinnow)
Alternate bearing is a key factor in limiting citrus production. Chemical controls have proved to be the most effective solution to this problem. Two different experiments were conducted to study the effects of different growth regulators (GA3, NAA, Ethephon) and urea on alternate bearing control in Kinnow mandarin (Citrus reticulata). In the first experiment, GA3 at concentrations of 0, 25, 50...
متن کامل