National standard of corn
The national standard of corn (GB 1353-2018) was formally implemented on February 1, 2019, and corn was divided into five grades. Among them, the bulk density of first-class corn is greater than or equal to 720g/l, the content of imperfect grains is less than or equal to 4.0%, the content of moldy grains is less than or equal to 2.0%, the content of impurities is less than or equal to 1.0%, the water content is less than or equal to 14.0%, and the color and smell are normal.
First-class corn: bulk density ≥ 720g/l, imperfect grain content ≤ 4.0%, moldy grain content ≤ 2.0%, impurity content ≤ 1.0%, moisture content ≤ 14.0%, color and smell normal.
Second-class corn: bulk density > 720g/l ≥ 690g/l, imperfect grain content ≤ 6.0%, moldy grain content ≤ 2.0%, impurity content ≤ 1.0%, moisture content ≤ 14.0%, color and smell normal.
Third-class corn: bulk density > 690g/l ≥ 660g/l, imperfect grain content ≤ 8.0%, moldy grain content ≤ 2.0%, impurity content ≤ 1.0%, moisture content ≤ 14.0%, color and smell normal.
Fourth-class corn: bulk density > 660g/l ≥ 630g/l, imperfect grain content ≤ 1.0%, moldy grain content ≤ 2.0%, impurity content ≤ 1.0%, moisture content ≤ 14.0%, color and smell normal.
Fifth-grade corn: bulk density > 630g/l ≥ 660g/l, imperfect grain content ≤ 15.0%, moldy grain content ≤ 2.0%, impurity content ≤ 1.0%, moisture content ≤ 14.0%, color and smell normal.
Other foreign products: bulk density
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What is organic fertilizer made of?
Organic fertilizer is made of human and animal manure, compost, cake fertilizer, grass ash, straw, green manure, rice bran, sawdust and so on. It contains a lot of organic matter, humic acid, vitamins, antibiotics and so on, which is the best fertilizer for orchard soil improvement in China. It can be divided into categories.
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When will winter wheat be topdressing
Winter wheat should be fertilized at seedling stage, overwintering stage, returning to green stage, jointing stage, booting stage and after heading. Farm manure was applied at seedling stage, ammonium bicarbonate or urea from overwintering to booting stage, and urea after heading. If the base fertilizer and seed fertilizer are sufficient, there is no need to topdressing at the seedling stage.
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