袁爷爷走了两年，他心心念念的海水稻怎么样了？
Saline soil refers to land containing so much salt that hardly any crop can grow in it. Globally, there are 950 million hectares of saline land, 100 million hectares of it in China, where arable land is just a little more at 128 million hectares.
Of the 100 million hectares, about 6.67 million hectares are located in coastal regions around the Bohai Bay and southeast provinces, which receive a lot of salt from the sea;
About 10 million hectares are in the northeastern provinces, where it is so cold in winter that the earth's surface remains frozen till a meter deep. When it is spring, the water on the surface evaporates, but the deeper earth is still frozen, keeping the salt there... That makes the soil saline.
About 66.67 million hectares are located in northwestern regions where there is so little rainfall that the salt on the earth's surface can hardly be washed away.
In the 1960s, there was a famous Party secretary in Lankao county, Henan province, called Jiao Yulu, who died at the age of 42, fighting saline soil. Saline land accounted for 36 percent of land in the county, bringing with it much poverty and misery for the people.
Yuan Longping once said: "Of the 1.5 billion mu of saline land in China, seawater rice can be grown in 200-300 million mu. If every mu produces 300 kg of rice, 100 million mu will mean 30 billion more kg of rice, enough to feed another 80 million people."
The seawater rice must be able to withstand water that contains 0.6 percent of salt or more, so as to save water resources;
Rice yield must reach 300 kilograms per mu (667 square meters), so as to be sustainable for the economy;
The total size of the plantation area must exceed 100 million mu so that it is an industry large enough.
前两项目标很快就实现了。2017年，青岛海水稻研究发展中心选育出了编号为“yc0045”耐盐碱水稻，在全生育期0.6%盐度的灌溉用水下亩产达到620千克。
Seawater rice not only grows in saline soil, but also helps to improve it. Its roots can pull nitrogen, phosphorus and potassium that most plants need, thus making the saline soil more fertile. These roots also make the saline soil porous, while the microbes that grow in them can improve the bacteria groups there.
Seawater rice is important, not only for producing hundreds of kg of food, but also for turning land previously unfit for cultivation arable. This way the size of arable land can be increased without diminishing forests or grasslands.
There will be one day when rice grows even in the drought-hit northwestern regions of the country, and Heilongjiang farmers could see harvest from the once wasted frozen fields. The scent of seawater rice will cover the saline soil, while the farmers there could enjoy white, sweet rice frown from their own fields.
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