The field seedlings of Daejeon are not called seedlings for a long time after transplanting. The types of stunting are nitrogen deficiency, phosphorus deficiency, potassium deficiency, and zinc deficiency.
The symptoms of nitrogen-deficient stunting are: small plants with few tillers, small leaves, yellow-green to yellow. The yellow leaves start from the tip of the leaf to the midrib and then extend to the whole leaf. The rice ear is short, the ear is small, and it is forced to mature early. The first reason is that the application of bottom fertilizer is insufficient; the second is that the soil fertility performance is not strong; the third is that the salt washing is not complete; the fourth is the excessive application of the base fertilizer.
The symptoms of phosphorus deficiency are: the new leaves are dark green, the old leaves are grayish purple, the leaves are erect, the long leaves are short, the leaves are curled when severe, and the roots are few and close, black. The reasons for phosphorus deficiency are: lack of available phosphorus in the soil; second, cold soaking of the soil, low water temperature, difficulty in absorbing phosphorus; third, toxic substances in the soil inhibit the absorption of phosphorus, resulting in physiological phosphorus deficiency.
The symptoms of potassium deficiency are: the plants are small, the leaves are dark green, and the tillers are few. The leaves are yellow-brown spots from the bottom to the base of the leaves, sometimes affecting the sheaths and stems, commonly known as red wilt. The root system is damaged and aging, falling off, new roots are less and perishable. The reasons for potassium deficiency are: low potassium content in paddy fields; second, nutrient imbalance caused by partial application of nitrogen fertilizer; and third, inhibition of potassium absorption by toxic substances.
The symptoms of zinc deficiency and zinc deficiency are that the ribs in the new leaves are chlorotic and white, and the tips of the old leaves are dry and dry. The leaves are yellow-red or auburn irregular rust spots from the bottom to the middle of the mid-flank, and then gradually enlarge. The new leaves are small, the leaves are slow, and the leaf sheaths are short. The plants are dwarfed and the severe old leaves are all dead. The new roots are less or not rooted, and then gradually darken. The reasons for zinc deficiency are: lack of effective zinc in neutral or alkaline soil; second, long flooding; third, zinc deficiency induced by large amount of phosphorus; fourth, low soil temperature, affecting the absorption of zinc.
The symptoms of the four kinds of elements caused by the lack of symptoms are different, and the supplementary measures should be symptomatic.
Drain the drainage ditch and improve the cold soaking environment. Whether it is plain or mountainous hills, all cold-soaked rice fields are generally deep in silt and poorly drained, resulting in low soil temperature and low water temperature, which affect rice seedlings. In this regard, the four types of rice fields that are lacking should open a large ditch, promptly eliminate excessive waterlogging in the field, prevent large-water irrigation, and promote shallow irrigation.
Improve the paddy soil and dry the fields in time. For soils that are more viscous, sand should be mixed with soil, and for salt with high salt content, salt should be washed. For those who have already developed a zombie momentum, they should be diligent in the fields or drained to dry the fields in order to increase the soil temperature and promote new roots.
Use neutralization to eliminate toxic substances. For the soil acidity or application of organic fertilizer that has not yet been decomposed, the organic acid content in the field is too high, and it can be sprayed with Huifulfeng or Zhuangfuxing active liquid fertilizer to detoxify and raise seedlings. Because the pH value of the fertilizer is 8 to 9.2, it has a strong neutralization effect, and the effect is remarkable. 150 ml of liquid fertilizer per acre is used, and 50 kg of water is sprayed. It is also possible to mix grass ash or lime with a ratio of 3:1.
Replenish fertilizers. If all four elements are missing, they should be applied at the time of topdressing. For what is lacking a single element, what is missing. For example, if zinc is deficient, it should be supplemented with about 3 kg of zinc sulphate per acre. For nitrogen deficiency, phosphorus deficiency and potassium deficiency, in addition to supplementing phosphorus and potassium, appropriate application of nitrogen fertilizer, in addition to nitrogen supplementation, can also improve The amount of phosphorus and potassium absorbed.
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