Based on the soil fertility and fertilizer effect of Beijing brown chao soil in the way of microtrial of winter wheatsummer maizer continuous cropping,the annual grain yield and the tenyear soil organic matter change show that the crops yield,soil organic matter and soil fertility can be improved significantly by using N P K chemical fertilizers together with organic material under lower soil fertility.

通過對(duì)北京褐潮土土壤肥力和肥料效益監(jiān)測(cè)基地10年定位微區(qū)試驗(yàn)的調(diào)查分析表明：在土壤肥力水平較低的情況下施用氮人人操人人摸人人骑、磷、鉀化肥及氮磷鉀化肥與有機(jī)物料配施，具有顯著提高糧食產(chǎn)量的作用人人操人人污，并較大幅度提高土壤有機(jī)質(zhì)含量；隨著有機(jī)物料施用量的增加欧美三级片免费看，效果更為明顯人人干干免费黄色视频9。