He also suggested that in the desert areas, people might "cultivate the land and adopt a fallow system
" as the cultivation and fallow system
minimizes the frequency of sandstorms.
These recent summer cover crop studies under commercial farm fields have shown that potato tuber yields can be increased if a summer sorghum-sudan crop is grown with limited irrigation, harvested for hay, or an aboveground sorghum-sudan incorporated crop is grown before the potato crop; the yields increased by 12% to 30% when compared to a wet fallow system
. These limited irrigation sorghum-sudan crops not only increased the yield, but there was also higher potato tuber quality--40% of the tubers weighed more than 8 ounces.
Related to these is the use of crop rotation and fallow system
. Crop rotation complements the gains of multiple cropping as it involves physical movement of crops around on a piece of land to ensure symbiotic benefit on the soil nutrient requirement among the crops rotated.
One of the most interesting features of the improved fallow system
is that it allows for forms of R&D that farmers can do on their own.
The Pwo traditionally practice short-cultivation, long-fallow farming, growing upland rice as a staple and other crops using a rotational fallow system
in mixed deciduous forest.
The winter wheat-summer fallow system
serves as the baseline for comparison since it is the predominant dryland cropping system of the region.
Residue production in the spring wheat/chemical fallow system
ranged from 3660 to 4210 kg [ha.sup.-1] (3268 to 3759 lb [ac.sup.-1]) for the east side and west side respectively.
Fundamentals of water conservation practices used in the summer fallow system
These authors also conducted a field study that showed that gravel mulches conserved up to 5.8 cm (2.3 in) of water per year more than a bare fallow system
. In a field study in Montana, gravel mulch reduced evaporation by up to 40 percent and water storage efficiency by as much as 45 percent in a two-year period compared to areas without such mulch (4).
Generally, the decline of food production in upland farming systems in the tropics has often been attributed to the lack of adoption of modern farming technologies and farmers have been unable to replenish nutrients lost in continuous cultivation which has replaced traditional bush fallow systems
(Hossner and Juo, 1999).
It encompasses principle of some ancient practices, including the shifting cultivation and the bush fallow systems
. Agroforestry practices emphasize sustainable production of food and wood products among its numerous benefits.