In the growth and development of wheat, a variety of nutrients are needed. If malnutrition is lacking and a certain nutrient element is absent, the wheat seedlings will show corresponding symptoms from the external form. Therefore, in the production, the types of elements required can be judged according to the symptoms of the wheat seedlings, and the right medicine can be prepared, and the fertilizer can be applied in time to ensure the seedlings grow robustly.
First, the plant with nitrogen deficiency is short, the leaves are light green, the tip of the leaf turns yellow from bottom to top, the tiller is less, and the stem is weak. Remedial measures: 5-8 kg of urea will be applied to 667 square meters during the rejuvenation period, and 10-15 kg of urea will be applied during the jointing period.
Second, deficiency of phosphorus Plants are small, secondary roots are less, less tiller, new leaves dark green, leaf tip purple, stems purple, can lead to small spikes, seeds are not full, 1000-grain weight decline. Remedy: Topdressing superphosphate, using 20-25 kg of superphosphate per 667 square meters with water. At the same time, the foliar spray 5% superphosphate solution, or 0.2% potassium dihydrogen phosphate solution, spray once every 7-10 days, even spray 2-3 times.
3. Potassium deficiency The potassium deficiency in wheat begins with yellowing from the tip and leaf margin of the lower old leaves. The leaves are soft and curled, then gradually brown. The veins are green, the stems are thin and weak, the tillers are irregular, and the earlets are less, resulting in uneven grain and easy lodging. Remedy: 667 square meters of potassium sulphate or potassium chloride 10 kg, and applied grass ash, 667 square meters of 100 kg, should also be sprayed with 0.2% potassium dihydrogen phosphate solution, once every 7-10 days, Spray even 2-3 times.
IV. Deficiency of zinc When the wheat seedlings are deficient in zinc, the leaves are chlorotic, the heart leaves are whitened, the internodes become shorter, the plants are short, the middle leaves are prematurely chapped and shrunk, the roots become black, the empty grains are more, and the 1000-grain weight is reduced. Remedy: Apply 0.3% zinc sulphate solution per 667 square meters of leaf surface during jointing, spray once every 5-7 days, and spray 2-3 times.
V. Boron deficiency The wheat tillers are not normal, the leaf sheaths are purple-brown, sometimes not heading, or only the flowers are not strong. Remedy: Foliar spray 0.2% borax solution, spray once every 7-10 days, even spray 2-3 times.
6. Iron deficiency When wheat is deficient in iron, it mainly occurs in new leaves, and the mesophyll tissue is yellowed, and the upper leaves can become yellow-white. The tip and leaf margin will also gradually wither and expand inward. Remedy: Foliar spray 0.2% ferrous sulfate solution, once every 7-10 days, even spray 2-3 times.
VII. Molybdenum deficiency The first step in the absence of molybdenum is in the front part of the leaf, the leaf turns brown, and then on the whole leaf of the lower part of the heart leaf, small yellow and white spots appear along the veins in parallel, and gradually become linear and flaky. The front part of the blade is dry and the whole whole leaf is dry. Remedy: Foliar spray 0.5% ammonium molybdate solution, spray once every 7-10 days, even spray 2-3 times.
Eight, manganese deficiency In the absence of manganese in wheat, the symptoms are similar to the lack of molybdenum, but the lesion occurs in the middle and back of the leaf. The diseased leaves are curled after drying and the front part of the leaf is gradually dry. Remedy: Foliar spray 0.2% manganese sulfate solution, spray once every 5-7 days, even spray 2-3 times.
Nine, magnesium deficiency The leaf margin tissue of the middle and lower leaves gradually loses green and yellow, the veins appear green, the leaf edges curl upwards or downwards, and the leaves are withered in the later stage. Remedy: Foliar spray 0.3% magnesium sulfate solution, spray once every 7-10 days, even spray 2-3 times.
X. Calcium deficiency When wheat is deficient in calcium, it is mainly manifested in new leaves, the upper leaves are obviously reduced, the veins are yellowed, the leaves and leaves near the growth point are dead, and the tip of the leaves is often bent. Remedy: Foliar application of 0.3% calcium chloride or 1% calcium perphosphate leaching solution, spray once every 7-10 days, even spray 2-3 times.
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