天津地区位于渤海沿岸,早春干旱,气溫低,地势低凹,土壤貭地粘重,为粘貭盐化沼泽草甸土,土壤肥力較高,其有机质含量在1.5%左右,全氮0.1%左右,代換量15毫克当量/100克土,全磷0.15%左右;土壤含盐量一般在0.2—0.3%左右。該区历年来水稻的产量是高而稳定的,这主要是由于农民具有丰富 Tianjin is located in the coast of Bohai Sea. Early spring drought, low temperature, low lying, low soil viscosity, soil sticky heavy, as sticky salt saline marsh meadow soil, higher soil fertility, the organic matter content of about 1.5%, total nitrogen 0.1% Or so, the substitution amount of 15 mg equivalent / 100 grams of soil, total phosphorus 0.15%; soil salt content is generally about 0.2-0.3%. The output of rice in the area has been high and stable over the years, mainly due to the abundance of peasants