秸秆

花匠小妙招
2024-11-10 10:25

摘要：

基质化是实现农业废弃物资源化利用的有效途径之一,为提升基质的水稻育秧效果,以玉米秸秆和有机肥为主要原料进行混料设计试验,通过考察不同处理水稻秧苗的壮苗指数,获得最佳水稻育秧基质配方;通过响应面实验优化基质成型工艺,以期获得优质育秧基质产品。结果表明,粉碎秸秆可显著(P<0.05)改善基质的总孔隙度和容重,提升秧苗的壮苗指数,有机肥显著(P<0.001)提高秧苗的干重累积。优化后的育秧基质包含24.84%(体积分数)的田园土,65.78%(体积分数)的秸秆和9.38%(体积分数)的有机肥。基质成型工艺优化结果显示,含水率大于40%的基质成型难度较高,压力对基质块品质影响显著。水稻基质成型最优工艺参数为含水率15.099%,压力18.401 kN,保压时间4.719 min。利用上述最佳基质配方获得的水稻基质壮苗指数较常规田园土提高49.02%,利用最优成型工艺获得的基质块跌碎率小于0.3%。

关键词: 农业有机废弃物, 基质化, 水稻育秧基质, 响应面, 基质压块工艺

Abstract:

Substrate is one of the effective ways to realize the resource utilization of agricultural wastes. To improve the rice seedlings raising effect of substrate, the mixture design experiment was carried out with corn straw and organic fertilizer as the main raw materials, the best formula for rice seedling substrate was obtained by assaying the rice seedling index under different treatments; and the substrate molding technology was optimized by response surface experiment to obtain high-quality seedling substrate products. The results showed that crushing straw could significantly (P<0.05) improve the total porosity and bulk density of the substrate, and increase the seedling index, and organic fertilizer could significantly (P<0.001) increase the dry weight accumulation of seedlings. The optimized seedling substrate contained 24.84% (volume fraction) of the garden soil, 65.78% (volume fraction) of the straw, and 9.38% (volume fraction) of the organic fertilizer. The optimization results of the substrate molding technology showed that the matrix with moisture content greater than 40% was more difficult to be formed, and the pressure appeared a significant effect on the quality of the substrate. The optimal parameters of rice substrate molding were moisture content of 15.099%, pressure of 18.401 kN, and pressure holding time of 4.719 min. The seedling index of rice substrate obtained by using the above-mentioned optimal substrate formula was 49.02% higher than that of conventional garden soil, and the breakage rate of substrate obtained by the optimal molding technology was less than 0.3%.

Key words: agricultural organic waste, substrate, rice seedling substrate, response surface, substrate molding technology

中图分类号:

S511