Key Techniques for Soil Testing Fertilization in Spring Maize in Dryland
I. Fertilizer requirements for spring corn in dryland:
The nitrogen absorbed during the whole growth period of corn was the most, potassium was the second, phosphorus was less, and microelements were slightly less. 70-80% of the nitrogen, phosphorus, and potassium nutrients have been completely absorbed before heading, and the absorption peak is in the big bellmouth period. Rational application of nitrogen, phosphorus and potassium element fertilizers and trace element fertilizers is particularly important for achieving stable and high yield of corn.
Second, spring maize fertilization techniques in dryland:
The total growth period of spring maize should be 3000-4000 kg of farmyard fertilizer, 16-18 kg of nitrogen fertilizer, 6-8 kg of phosphate fertilizer (P2O5), and 4-6 kg of potassium fertilizer (K2O). 1 kg of zinc fertilizer and 1 kg of boron fertilizer. Farmyard fertilizers are applied one time before sowing, and the nitrogen fertilizer is applied to the base fertilizer and the topdressing fertilizer twice. Phosphorus fertilizer, potash fertilizer and trace fertilizer are all applied as base fertilizer.
Base fertilizer: (1) Mushi farmyard fertilizer 3000-4000 kg, Cowote formula fertilizer 40 kg, urea 10 kg, zinc fertilizer boron 1 kg each; (2) Mushi farmyard fertilizer 3000-4000 kg, urea 16-20 kg, phosphate two Ammonium 15-18 kg, potassium sulfate 8-10 kg, zinc, boron 1 kg each. It is strongly recommended to use special formula fertilizer.
Top dressing: big bell mouth early dressing: Mushi urea 10-15 kg.
Note: Promote deeper application of chemical fertilizers and eliminate appetite. The fertilization depths of basal fertilizer and topdressing fertilizer were respectively 15-20cm and 5-10cm, and the topdressing rice ditch was 10cm away from the root of corn to prevent burning seedlings.
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