Search results
Results from the WOW.Com Content Network
Tillage is meant to inhibit growth of weeds by overturning the soil; however, this has a countering effect of exposing weed seeds that may have gotten buried and burying valuable crop seeds. Under crop rotation, the number of viable seeds in the soil is reduced through the reduction of the weed population.
SRF is the practice of cultivating fast-growing trees that reach their economically optimum size between 8 and 20 years old. Species used are selected on this basis and include alder, ash, southern beech, birch, Eucalyptus, poplar, willow, [1] [2] new varieties of Paulownia elongata, paper mulberry, Australian blackwood and sycamore.
Organic crop rotations frequently include weed-suppressive cover crops and crops with dissimilar life cycles to discourage weeds associated with a particular crop. [57] Research is ongoing to develop organic methods to promote the growth of natural microorganisms that suppress the growth or germination of common weeds. [59]
Short-rotation coppice has recently gained importance in many countries as a means of providing additional environmental benefits. Some species, such as poplar and willow , have been successfully used for soil [ 23 ] and sludge [ 24 ] trace element phytoextraction , and for groundwater [ 25 ] and sewage wastewater [ 26 ] rhizofiltration .
In forestry rotation analysis, economically optimum rotation can be defined as “that age of rotation when the harvest of stumpage will generate the maximum revenue or economic yield”. In an economically optimum forest rotation analysis, the decision regarding optimum rotation age is undertake by calculating the maximum net present value. It ...
Intercropping is a multiple cropping practice that involves the cultivation of two or more crops simultaneously on the same field, a form of polyculture. [1] [2] The most common goal of intercropping is to produce a greater yield on a given piece of land by making use of resources or ecological processes that would otherwise not be utilized by a single crop.
Shifting cultivation is a form of agriculture or a cultivation system in which, at any particular point in time, a minority of 'fields' are in cultivation and a majority are in various stages of natural re-growth. Over time, fields are cultivated for a relatively short time, and allowed to recover, or are fallowed, for a relatively long time.
Crop rotation with at least 6 years between planting of a susceptible crop is an effective means to reduce nematode population densities to below damage threshold. However, the best way to manage potato cyst nematodes is the use of (partial) resistant potato varieties.