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铁岭地区地处辽宁北部,约有300万亩棕黄土等低产土壤,这些土壤有机质平均含量在1.2%左右,全氮0.1%左右,有效磷4ppm以下,物理性状不良,是影响全区粮食产量迅速上升的主要问题.我们试图通过生物措施对这些低产土壤进行改良,于1974年进行草木樨(二年生白花草木樨,以下均同)与粮食作物轮作试验.经五年工作,初步摸清在低产土壤上实行草木樨、粮食作物轮作的增产效果及轮作方式.通过培养典型,树立样板,使研究成果得到了推广.到1978年已推广30多万亩.现将几年的试验与调查结果整理如下:
Tieling area is located in northern Liaoning, about 300 acres of brown loess and other low-yielding soil, the average content of organic matter in these soils is about 1.2%, about 0.1% of total nitrogen, phosphorus 4ppm or less, poor physical properties affect the rapid grain yield in the region We tried to improve these low-yield soils through biological measures and carried out the test of rotations of grasses (perennials, perennials, and below) and grain crops in 1974. After five years of work, we initially found out that in low-yielding soils On the implementation of crop rotation, crop yield crop rotation and rotation by way of cultivating a typical model to promote the research has been promoted to more than 30 million mu in 1978. Now several years of testing and survey results are organized as follows :