China's sulfur fertilizer demand and research
Sulphur deficiency in China's soil:
1. Collecting more than 22,000 soil samples in 24 major agricultural provinces, and analyzing and determining the soil sulfur fertility level. The results show that 30% of the cultivated land is deficient in sulfur, with an area of ​​40 million hectares; 20% of the cultivated land is potentially sulfur-deficient. 20 million in size
Are.
2. Most of the sulfur-deficient soils are distributed in Anhui, Fujian, Guangdong, Guangxi, Heilongjiang, Henan, Hunan, Jiangxi, Shaanxi and Yunnan provinces.
3. The field test results show that when the average amount of sulfur is 30 kg/ha, the crop yield and economic benefit are the largest, and the soil fertility is maintained. It can be seen that the total demand for sulfur fertilizer in China's agricultural production is about 1.8 million tons.
Effect of sulfur fertilizer on crop yield
1. In the past 10 years, more than 600 field trials have been completed on major crops. More than 85% of the test results show that sulfur application can significantly increase the yield of sulfur fertilizer by 2, citrus, soybean, sugar cane, sweet potato, peanut and tea. Good, generally at 10% or higher.
3. The residual effects of sulphur fertilizer were studied through 63 field trials. The field trials of applying sulphur fertilizer to 35 sorghum crops showed an increase in yield, with an increase of 2%-7%, equivalent to 40% of the sulphur effect in the current season. -60%.
4. In some southern provinces with high fertilizer content and severe soil sulfur deficiency, such as Jiangsu, Yunnan, Jiangxi, Anhui, Fujian, Guangdong and Guangxi, the effect of sulfur fertilizer on crop yield increase is more obvious.
5. The results of more than 300 field trials in 14 provinces showed that under different soil types and fertilizer management conditions, the sulfur application of grain crops increased to 60 kg/ha (single sulfur), and the sulfur content of oil, sugar and vegetables increased to 90. When kg/ha (single sulfur), the yield is significantly improved. The optimum sulphur content of cereal crops is 30-40 kg/ha (single sulphur); the optimum sulphur content of economic crops such as oil, sugar and vegetables is 40-60 kg/ha (single sulphur).
Effect of sulfur fertilizer on crop quality and plant health
1. Sulfur is the basic tissue component of three amino acids and plays an important role in the synthesis of proteins, fats and vitamins. Sulfur fertilizer plays a decisive role in improving crop quality and market value, especially for crops such as wheat, canola, sugar cane, fruits, vegetables and tea.
2. Field test results show that sulfur fertilizer can increase the content of crude protein in rice and wheat by 10%-27%, the oil content of peanut and rapeseed is 6.5%, the sugar content of sugarcane and banana is 10%-23%, and the amino acid of tea. The content is 6.6%, and the Vc content of citrus is 4.4%.
3. Sulfur fertilizer can reduce the nitrate content of leafy vegetables by 10%-50%.
4. Sulfur fertilizer can also promote healthy growth of crops and reduce the occurrence of pests and diseases.
Economic benefits of sulfur fertilizer
1. Application of sulphur fertilizer improves crop yield and quality, thereby improving fertilizer utilization efficiency and obtaining high economic benefits. In all test crops, the ratio of production to investment was 40:1 from 9:1 for food crops to the highest for fruits.
2. Sulfur application can also promote the absorption of nitrogen and phosphorus nutrients and improve the efficiency of nutrient use. When applying sulfur fertilizer, compared with the control, the nitrogen uptake of food crops increased by 3.0-57kg/ha, oil crops increased by 15-63 kg/ha, economic crops increased by 20-97 kg/ha, and nitrogen fertilizer utilization increased by 4%-40%. .
3. Sulfur application can also promote the absorption of phosphorus nutrients. Compared with the control, the phosphorus uptake of food crops increases by 1.0-5.3kg/ha, the oil crops increase by 1.2-5.1kg/ha, and the utilization rate of phosphate fertilizer increases by 5%-11%.
Improve the impact of sulfur fertilizer use on Chinese agriculture and fertilizers
Increasing the use of sulphur fertilizer is essential for promoting sustainable agricultural development, preventing soil sulphur deficiency and adverse effects on crop yields and benefits due to sulphur deficiency.
1. The results showed that the application of sulfur fertilizer 30kg/ha on the soil with sulfur deficiency increased the yield of the average crop by 10%, that is, increased rice yield by 0.6t/ha. Therefore, it is increasing every year in China’s 64 million hectares of arable land that is deficient in sulfur or potentially sulfur-deficient.
Food production will reach 38 million tons.
2. Sulfur fertilizer also improves fertilizer utilization efficiency and increases farmers' income, and the utilization rate of nitrogen fertilizer is increased by at least 5%. As society pays more and more attention to fertilizer prices and the impact of fertilization on the environment, sulfur fertilizers are used in precision agriculture and fertilizer management.
Improving the efficiency of crop nutrient absorption and utilization plays a crucial role.
3. In some major agricultural provinces, sulphur has been included in the recommended fertilization system, in which the recommended sulphur content of cereal crops is 20-40 kg/ha, and beans, oilseeds and vegetables are 30-60 kg/ha (Table 2). ).
4. In 2000, the Chinese government re-recognized sulfur as a plant nutrient element and encouraged the addition of sulfur to NPK fertilizers.
5. In 2006, the output of sulfur-containing compound fertilizer reached 9 million tons, of which sulfur nutrients accounted for 900,000 tons.
In 2006, two sulfur-coated urea production lines were put into use, with an annual production capacity of 110,000 tons and 300,000 tons respectively. Among them, sulfur nutrient content reached 40 tons, and more sulfur-containing compound fertilizer projects are under construction.
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