Matters needing attention in adjusting acid in rice seedbed
Adjust the acid of nutritious soil to PH5 or so. Adjust acid in bed (100m2 with concentrated sulfuric acid 500ml, dilute and pour well). Adjust acid at seedling stage (spray acidified water diluted to about 3000 times according to the condition of bed soil after one leaf and one heart, pay attention to washing seedlings)
Rice seedlings are suitable to grow under the acidic condition of soil pH4.5~5.5, and too low or too high pH is not conducive to seedling growth. Acid regulation makes the main indexes such as root system and stem width of rice reach an ideal state, which not only promotes strong seedlings, but also inhibits blight at seedling stage.
The idea of saline-alkali weight is to regulate acid in three aspects to adjust the environment of the whole seedling growing period to the most suitable degree:
One is to adjust the acidity of nutritious soil to about PH5.
Second, put the bed to adjust acid (100m2 with concentrated sulfuric acid 500ml, diluted and poured well)
Third, adjust the acid in the seedling stage (spray and dilute the acidified water into about 3000 times according to the condition of the bed soil after one leaf, pay attention to washing the seedlings).
Methods:
(1) 100 square meters (Honda 1 hectare) 98% concentrated sulfuric acid 3 kg is poured into 300 kg of water, and the prepared 1% sulfuric acid water is sprayed on the 100 square meter seedling bed the day before setting the plate for sowing. The soil pH value of the bed was between 4.5 and 5.5.
(2) 100m2 (Honda 1 hectare) 98% concentrated sulfuric acid is poured into 30 kg water to form about 25% acidified water and sprinkled on the sifted 500kg bed soil, thoroughly mixed for 6 times in 24 hours to make acidified soil samples, and then mixed with 1500 kg sifted soil to cover strictly.
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