Chlorine crops are common in agricultural scientific literature and materials. For example, because chloride ions contain chloride ions, they have adverse effects on the yield and quality of chlorine-free crops such as sweet potato, potato, sugar cane, sugar beet, citrus, tobacco, and tea. Therefore, it should not be used more; it should not be applied on heavy saline soil and chlorine-free crops such as tobacco and potato. Any kind of fertilizer is beneficial in quantity and harmful in excess. If the application of nitrogen fertilizer is too much, it will cause crops to fall, reduce production, and reduce quality. Therefore, it is worth discussing whether these crops are listed as nitrogen-repellent crops.

In 1954, Broyer et al. determined that chlorine is an essential nutrient for higher plants. Chlorine has many physiological functions in plants, some chlorine participates in biochemical reactions, and some chlorine maintains various physiological balances in the ion state. Chlorine acts as an activator during the photolysis of water in plant photosynthesis, promoting the release of oxygen and reducing nicotinamide adenine dinucleotide phosphate (NADP). Chlorine can enhance the firmness of stems and leaves, improve the resistance to disease and disease, and also promote the effective nutrient in the soil, promote the absorption of potassium, magnesium and calcium in crops, and increase photosynthesis and sugar accumulation.

Containing chlorinated fertilizer means that the fertilizer contains chloride ions such as potassium chloride and ammonium chloride. At present, 96% of the potash produced in the world is used for agriculture, and potassium chloride is the main one. Ammonium chloride is also increasingly developed as a by-product of the alkali industry, with 1 t of ammonium chloride per lt soda.

For a long time, due to the influence of the chlorine crops, the company does not dare to use chlorinated fertilizer on crops. There are many rice glutinous rice, wheat lodging, rape red grains, sugar cane not long, citrus acid, sweet potato easy to rotten, potato yield. Low phenomenon. On the one hand, the soil is deficient in potassium. For example, there are 14,000 hm2 of cultivated land in our county, which is caused by potassium deficiency and lack of scope. On the other hand, it is affected by chlorine crops, and potassium fertilizer is not used. With the continuous development of agricultural production, it is imperative to promote the application of chlorinated fertilizers such as potassium chloride.

The Soil and Fertilizer Institute of Jiangsu Academy of Agricultural Sciences will carry out a six-year positioning experiment on rice, wheat and rapeseed with chlorinated fertilizer. The results show that the fertilizer containing chlorinated fertilizer has high fertilizer efficiency and stable yield increase. The annual average yield of rice is 46.5～316.5kg/hm2, wheat 157.5. ~ 217.5kg / hm2, rapeseed 127.5 ~ 172.5kg / hm2.

Under the auspices of Professor Ma Guorui from the Department of Soil Chemistry of Zhejiang Agricultural University, the county carried out research on the effects of chlorinated fertilizer on the yield and quality of sweet potato and potato. From our test results in Hanglongwu Village, the potato was fertilized with ammonium sulfate 150kg/hm2, potassium sulfate 150kg/hm2 in the chlorine-free zone, fresh potato yield 12570kg/hm2; ammonium chloride 125.25kg/hm2, potassium sulfate 150kg /hm2 In the low-chlorine zone, the fresh potato yield is 14760kg/hm2; the ammonium chloride is 125.25kg/hm2, the potassium chloride is 125.25kg/hm2, and the fresh potato yield is 15960kg/hm2. The low-chlorine zone increased the yield by 2190kg/hm2 than the chlorine-free zone, and the yield increased by 17.42%. The high-chlorination zone increased the yield by 3390kg]hm2 compared with the chlorine-free zone, and the yield increased by 26.96%. The yield increase effect was remarkable. From the trial to 1990, the cumulative application of chlorinated fertilizer (mainly potassium chloride) area of ​​2946.7hm2, increased yield of fresh potato 14025t, net increase of output value of 1,4832 yuan, and achieved good economic benefits. The project “Promotion and Application of Chlorinated Fertilizer on Sweet Potato and Potato” won the fourth prize of Ningbo Agricultural Harvest in 1991. The “Study on the Effect of Chloride Fertilizer on Sweet Potato and Potato Yield and Quality” won the third prize of Zhejiang Science and Technology Progress Award in 1987.

The use of chlorinated fertilizers on chlorine-repellent crops has also been reported in China. The Institute of Sucrose Research of the Ministry of Light Industry has conducted experiments in Guangdong for nearly ten years. It shows that the application of potassium chloride per hm2 is 112.5-150kg, and the production of sugar cane per hm2 is more than 15t, which can increase the sugar content of sugarcane stems by O.2%~0.58%.

Potatoes have traditionally been considered typical chlorine-repellent crops. However, according to research in our province, in the case of 142.5kg of potassium chloride per hm2, the yield is increased by about 10% compared with chlorine-free treatment, and there is no adverse effect on the moisture content of fresh potato and the content of sweet potato starch. The chlorine content in the soil is also Not increased with the application of chlorinated fertilizer. Our county test showed that 142.5kg of potassium chloride per hm2 increased yield by 2190~3390k compared with no application of chlorinated fertilizer, and the yield increased by 17.42-26.96%.

Sweet potato, our province's research shows that in the case of 193.5kg of potassium chloride per hm2, the yield of fresh potato increased slightly, the rate of sweet potato and the starch content increased, and the rate of rotten potato in the storage period of potato tubers decreased slightly, sweet potato The application of chlorinated fertilizer had no adverse effects on yield, quality and rotten potato rate. Our county test showed that potassium chloride was applied 150~225k per hm2, which increased the yield of fresh potatoes by more than 10%.

Tea leaves contain 0.2% to 0.6% chloride ions in tea leaves. In the early 1980s, the Tea Research Institute of the Chinese Academy of Agricultural Sciences tested the effects of potassium chloride and potassium sulphate and pointed out that in the case of the annual application of potassium chloride 150kg/hm2, the three-year production was similar to that of potassium sulphate. No chlorine was found. There is no adverse effect on the quality of red and green tea and the fermentation performance of black tea. However, the amount of potassium chloride in young tea gardens should be less, and the amount per hm2 should not exceed 112.5 kg.

Tobacco is a chlorine-tolerant crop. No poisoning symptoms occur when 220.5 kg of potassium chloride is applied per hm2, but the chloride ion is too high and the quality is degraded. It has also been reported that the quality of 150 kg of potassium chloride per hm2 applied in spring did not decrease, while the yield and price of tobacco leaves were improved.

Citrus, according to the experiment of the Citrus Institute of the Chinese Academy of Agricultural Sciences, the potassium chloride treatment can reduce the acid content of the fruit and increase the fruit compared with the same amount of potassium sulfate treatment. The sweet taste increases the Vc content of the fruit and increases the nutritional value of the fruit. However, potassium chloride should be stopped for 1 to 2 years after application for 3 to 5 years. According to the research of the Guangdong Academy of Agricultural Sciences, each orange tree was applied with 0.25 kg of potassium chloride, which increased the yield of fresh orange by 10.5 kg, the sugar content increased by 1.14%, and the Vc increased by 5.8%.

Through experiments in recent years, the amount and method of applying chlorinated fertilizer to potatoes and other crops is: potato, 125.25 kg of ammonium chloride per hm2 base and 125.25 kg of potassium chloride, open a hole and cover a layer of thin soil. Planting. Sweet potato, 157.5kg of ammonium chloride per hm2 base and 187.5kg of potassium chloride, potassium chloride as top dressing 7.5~112.5kg per hm2, open hole application. Sugarcane, before application to large-scale soil, apply 420kg of ammonium chloride and 123.75kg of potassium chloride per hm2, and apply soil after application. Tea, mature tea gardens, 247.5kg of potassium chloride per hm2, 40% before spring tea, 30% before summer and autumn tea; potassium chloride per hm2 in young tea gardens reduced to 187.5kg. Citrus, 0.25-0.5 kg of potassium chloride per plant, of which 1/3 of the flowering period and 2/3 of the fruiting period.

The application of chlorinated fertilizers on so-called bogey-free crops is not as good as possible. According to relevant data, the threshold of chlorine damage (critical concentration) is 800 mg/kg for potato, 2000 mg/kg for sugar cane and 5000 mg/kg for sweet potato. If the crop is poor in chlorine, it will grow poorly. When chlorine deficiency occurs, the chlorine concentration in the plant tissue can only be maintained at 2-20 mmol/g dry weight. Only when the chlorine is reduced to such a lack of concentration, the chlorine fertilizer will be applied. There is a significant growth effect, otherwise it is harmful.

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