1. Suitable lime dosage for different crops with different PH value
When the soil pH value is 4.5-5.4, the appropriate amount of lime for planting corn and soybean soil is 1250-1500 kg per hectare; the suitable amount of lime for planting rice soil is 975-1350 kg per hectare. When the soil pH is 5.5-6.0, the amount of lime applied to grow corn and soybean can be reduced accordingly. When the soil pH is 6.5, little or no lime can be applied.
2. Effect of different lime dosage on crop yield
When the soil PH value is below 5.5, corn has a significant effect on the yield of 750 kg per hectare. The average increase rate is 7.15%, and the average yield is 0.55 kg per 1 kg of lime. The use of lime is 1125 kg per hectare, and the rate of increase is 14.78%. Every kilogram of lime can increase output by 0.75 kilograms, which is the best economical consumption. Applying lime can produce 1500-1875 kilograms per hectare. Although it can also increase production, the yield increase per kilogram of lime is obviously reduced. 1125 kg per hectare of lime applied by rice was the best economical rate, with an increase rate of 14.54%, and an average yield of 0.99 kg per 1 kg of lime; lime application exceeded 1500 kg per hectare, and the yield increase per 1 kg of lime showed a significant downward trend.
3. Effect of lime application on crop growth traits
The use of lime to improve acidic cold-sweeping fields can significantly promote the growth of corn, rice, soybeans and other crops. The performance of lime-applied fields generally increased by 5-10 cm, the spike length increased by 1.0-3.6 cm, and the spike coarseness increased by 0.2-1.1 cm, and the 100-grain weight also increased significantly compared with the maize plants without lime (control) plots. Large-spot disease reduced grade 1, live stalk maturity.
4. Effect of increasing age of lime production
The improvement effect of lime on acidic soil has a certain relationship with its different application age. When lime and corn were used in the same year, the yield was increased by 13.3% and 11.2%, respectively. The increase in the rate of increase in corn yield was increased by 3.5% for two consecutive years, and the yield increase in rice was increased by 2.2%. The application effect was similar to that for one year in the next year; Soybean was applied for one year and continuously. The effect of application for 2 years is obviously better than that of corn and rice. The special precautions for agricultural machinery in the field, especially the effect of continuous application for 2 years, can be increased by 18.4 percentage points compared with the increase rate of 1 year, which is obviously better than corn and rice.
5. Effect of Lime Improvement on Acidic Cold-immersion and Low-yield Fields
The first is to adjust the soil pH value. Acid soils generally use 1165 to 15,000 kilograms per hectare of lime, which can increase the soil pH from 5.5 to 6.0 to 6.5. If lime is used for more than 1500 kilograms per hectare or if lime is continuously applied for more than 2 years, the pH of the soil can be made close to neutral [4-5]. Therefore, the optimal amount of lime is 1195-1500 kg per hectare, and the maximum application period is 2 years. The second is to increase soil available nutrients, soil total nitrogen increased 0.014%-0.031%, available phosphorus increased by 0.5-1.2 mg / kg; available potassium increased by 8-17 mg / kg. The third is to improve soil physical properties. Soil bulk density decreased 0.11-1.19 grams per cubic meter, soil porosity increased by 2.63%-4.71%, soil moisture increased by 0.3%-0.9%.
Yancheng Rongtai Labware Co.,Ltd , https://www.rongtailab.com