Film mulching treatment inf luences dry matter and yield of oil flax in semi-arid area of China

A feld study was set up to compare dry matter accumulation and grain yield of 3 different types of flm mulching, namely FFC （full flm muched on tiny ridges covered with soil）, PFC （full flm muched covered with soil）, and PF （full flm muched with no cover）. The experiment was laid out in a complete random design with 3 replications at north-west （34°40′N, 105°06′E） of China. This study determined that （1） flm mulching treatment increased leaf area and dry matter accumulation of oil fax in semi-arid areas; （2） accu-mulation of dry matter under PFC treatment was markedly higher than other treatments except anthesis stage; （3） average grain yield of oil fax under flm mulching treatment was 52.67%-60.33% higher than fat plot without mulched or ridge （CK） treatment; （4） grain yield of oil fax was substantially correlated with plant height, grain number and 1,000 kernels weight. This study demonstrated that flm mulching has signifcant effects on crop grain yield improvement in the northwest of China.

基于IPAT方程的地膜投入与粮食产量的脱钩分析

基于脱钩理论,运用IPAT方程对甘肃省2003-2022年的地膜投入与粮食产量的脱钩程度进行分析,并预测其后十年的地膜投入量和粮食产量的脱钩状态。结果显示:2003年以后甘肃省的地膜投入量与粮食产量呈现出由衰退性脱钩向复钩的转变,并在2008年之后一直处于扩张性复钩状态;地膜投入对粮食作物的增产效应尚未达到上限,未来地膜使用仍可发挥重要作用;脱钩的主要影响因素为政府利农政策和地膜使用效率。建议普及农机配套设施并完善地膜回收政策,与此同时,发展秸秆覆盖等新农业技术。

新疆地区棉田膜面杂质测定试验研究

现有残膜回收机回收的残膜普遍存在杂质含量较高、残膜易与秸秆及泥土混合以及膜杂分离困难等问题,为了指导残膜回收机具的设计,本文依据新疆地区棉田情况,开展棉田膜面杂质测定试验。采用五点取样法对7个区域进行膜面杂质测定。结果表明,膜面杂质主要成分为土壤约占71.38%,落地棉、棉壳、碎秸秆以及叶片等杂质占比为28.62%。该试验结果可为后续膜面杂质去除机构提供理论支持。