Microelements play an irreplaceable role in the growth and development of wheat. Increasing the application of microelements fertilizer scientifically is an important technical measure for high and stable yield of wheat.
Iron fertilizer, wheat form 1 ton of dry matter, need to absorb 232 grams of iron. In case of iron deficiency, the leaves are yellow and green, with small spots, white patches or stripes on the young leaves and early withering of the old ones.
Boron fertilizer, wheat needs to absorb 18 grams of boron for each ton of dry matter. When boron is deficient, the stem and leaf are thick and curved, the leaves are purple, the meristem at the top is dead, forming “top withering”, the filament extension and tillering are not normal, the ear development of wheat is not good, the seed setting rate is very poor, and in the later stage of serious cases, “ear is not mature”. Applying boron fertilizer to boron deficient soil can increase wheat yield by more than 10%.
For each ton of dry matter formed by manganese fertilizer, wheat needs to absorb 26G of manganese. In the absence of manganese, the veins lose green and yellow at the initial stage, and small yellow white spots appear, and then gradually expand to form yellow brown spots. There is a clear transverse line of weakened tissue near the tip of the leaf, causing the upper end of the leaf to bend and droop; the root system is poorly developed, some of them turn black and die; the plant grows slowly, without tillers or few tillers.
For copper fertilizer, wheat needs to absorb 8 grams of copper per ton of dry matter. In case of copper deficiency, the new leaf is gray green, the tip is white, the leaf is twisted, and the lower part of the leaf sheath appears gray white spots or stripes, and the old leaf is easy to break or bend at the leaf tongue; the internode of the plant is shortened, and the heading is few, and in serious cases, the heading or the shape of the ear is not twisted, the secondary flowers on the spikelet are abortion, and the grain development is incomplete or shrunk.
For zinc fertilizer, wheat needs to absorb 21g of zinc per ton of dry matter. When zinc deficiency occurred, the plants were dwarfed and clustered, the leaf margin was twisted or shrunk, the two sides of the leaf vein changed from green to yellow to white, and yellow, white and green stripes appeared on the edge. According to the comparative experiments in different regions, the application of zinc fertilizer in zinc deficient areas can increase wheat yield by more than 5-10%.
For the base fertilizer without microelement fertilizer, it can be combined with disease and pest control in the middle and later stage to spray on the leaf. Spraying time: jointing stage, flowering stage and booting stage. Spraying after 5 p.m. is the best time.
Post time: Apr-29-2020