要 旨:
Problems and Challenges: The Dry Zone covers approximately 677,000 km2,
where about 11 million people live. The landscape is broadly undulating
covered with scattered shrubs and poor quality grasses. It has the characteristics
of very low and erratic rainfall over time and space, shallow soils with
low fertility and low moisture holding capacity. In most areas, land degradation
and erosion rates are severe leading to chronic food insecurity and poverty.
The improper cultural practices of farmers in their cropping patterns,
land preparation, and soil and water management systems enhance the deterioration
of the fragile ecosystems. As fuel wood and animal feed are in scarcity,
it is often substituted by plant residues, which leads to decrease in organic
matter and fertility of the soil.
Cropping pattern research : A diagnostic survey was done at the 12 Agricultural
Extension villages in Kyaukpadaung township during April, 2002 to March,
2003. This base line study was primarily aimed at the identification of
stable cropping systems relevant to small farmers operating under serious
labor and capital constraints. Small land holdings and high labor-land
ratios make the complex multi-crop production systems possible in most
parts of the study sites. Multiple cropping patterns such as mixed cropping,
intercropping, relay cropping and crop rotation are generally practiced
with the objective of reducing the crop losses. The Dry Zone stands as
"main-surplus-producing area" of pulses and oil seed crops.
Pulses have been an enormous increase in production since the liberalization
in legume export market in 1990. Oil seed crops are grown as sole, however,
in most areas, monsoon sesame or peanut is broadcast between pigeon pea
rows. After the harvest, mung bean or cowpea were planted between the rows
as the sequential crops.
Since there is no functioning policy to cover crop failure, farmers are
not motivated by higher input and better management. To increase the agricultural
products, the land has been used extensively and beyond its capacity. The
productivity of current farming systems and the protection of environmental
quality cannot be sustained for long if we continue such practices as the
application of very few nutrients, and inefficient utilization of crop
residues. Ways need to be sought to increase the use of compost, improve
soil fertility, harvest more rain water, and enhance farm productivity.