Effects of Different Gravel Mulching on Soil Moisture Status and Regression Model Prediction in Arid Regions

Drought is one of the main factors limiting agricultural planting and production; gravel mulching an effective inhibiting evaporation water-saving pattern in arid regions. In this study, experiments were conducted to study soil moisture effect regression model with different mulching, content compared that mulched particle sizes, thickness layer years. The results showed that: 1) cumulative was only 29.3% bare fields. Mulching could significantly reduce evaporation. 2) effects are best when mulch 10 - 15 cm. 3) size smaller, inhibition will be better. Considering water holding capacity material economy, it most suitable 3 5 4) on surface for 1 years can improve content. However, more than five years, decreased significantly. 5) quadratic polynomial fitting better simulate predict mulched, degree R2 0.98.