Nitrogen deficiency mainly shows that the plants are short, thin, weak, with slow growth, few and weak tillers, small and erect leaves, yellowish-green leaves, and dry tips of old leaves. They gradually develop yellowish leaves at the base, and the stems are sometimes lavender, and the roots are undeveloped. The number of roots is small and short, the panicles are small and the panicles are small, the maturation period is advanced, and the yield is low. Remedial measures: Nitrogen deficiency at the seedling stage and returning to the green period, 7 to 8 kg of urea or 20 to 25 kg of ammonium bicarbonate per mu, or 600 to 700 kg of human waste can be applied between the rows or the water; During the period, topdressing urea 10~15 kg. For wheat fields with faded leaf color and premature symptoms of nitrogen deficiency after heading, 50-60 kg of 1-2% urea solution per acre can be used for foliar application.
Phosphorus-deficient seedlings grow slowly, the plants are short, the leaves appear dark green, dull, and the leaf and sheath sheaths become purple when severely deficient in phosphorus (this is the typical symptom of identifying phosphorus deficiency in wheat). The secondary roots are weak and weak, and the tillering rate is low. Low, heading, delayed flowering, pollen formation and fertilization are affected, grouting is not normal, 1000-grain weight is reduced, and quality is poor. Remedial measures: Phosphorus deficiency at seedling stage, 35-40 kg of superphosphate per acre, deep-sedimentation; phosphorus deficiency in middle and late stages, 200-250 g of potassium dihydrogen phosphate per acre, 50 kg of water per acre in the early stage of booting Spray, spray once every 7~10 days, even spray 2~3 times.
The leaf tip and leaf margin of the lower leaf of the potassium-deficient wheat seedling first turns yellow, and then gradually turns brown, and looks far like a fire. When the leaf is dry, the entire leaf is dry and the stem is small and weak, the roots are stunted, and lodging is easy. Remedial measures: Apply 10 kg of potassium chloride or 50 kg of ash per acre during the seedling stage; spray 0.2-0.3% of potassium dihydrogen phosphate solution 50 kg in the middle and late stages of wheat growth, spraying once every 7-10 days, even spraying 2~3 times.
Zinc deficiency seedling leaf defoliation leaves chlorosis, heart whitening, zinc deficiency in the middle and late plants dwarf, small and brittle leaves, shorten internodes, plant dwarf clusters, roots turn yellow, more empty grains, 1000 grain weight is low. Remedy: Spray with 0.2%~0.3% zinc sulfate solution and spray 2~3 times to make the leaves green.
Deficiency of boron stems and leaves hypertrophy, bending, leaf sheath was purple brown, delayed growth period, pollen grains do not germinate, resulting in flowers without real, affecting the seed setting rate, when there is serious boron deficiency, there will be empty ear. Remedy: Use 150 to 200 grams of borax for 50 to 60 kilograms of water for foliar spraying, spray once at the wheat seedling stage and heading date.
Manganese deficiency is mainly manifested by the soft underside of the leaves, new veins striped chlorosis, from yellow-green to yellow, veins are still green; sometimes the leaves are light green, yellow stripes expand into brown spots, and the tip appears scorch. Remedy: Apply 1 kg of manganese sulfate per acre, or foliar spray of 0.1% to 0.2% of manganese sulfate solution 2~3 times.
Iron deficiency in the wheat seedling period found chlorotic chlorosis, gradually leaves the whole leaf chlorosis yellow-white, it is the performance of iron deficiency. Remedy: Use 0.1~0.2% ferrous sulfate solution to spray, every 7~10 days, even spray 2~3 times, the effect is good.
Copper deficiency When the tip of the wheat leaves turns white and the edges are yellow-gray, it is a copper deficiency. Serious can hinder heading and flowering. Remedy: Use 0.03% to 0.04% copper sulphate solution to spray 2 to 3 times.
The lack of molybdenum mainly manifests as chlorotic chlorosis of leaves, starting from the tip of the old leaf to the edge of the leaf, and then spreading inward by the leaf margin, first the spots, then the lines and slices, and the yellowing part turns brown. Finally died. Remedy: Spray 0.5% ammonium molybdate solution on the foliage, spray once every 7 to 10 days, and spray 2~3 times.
The edge of the magnesium deficiency leaves yellow and leaves yellow, but the veins are still green. In severe cases, the edges of the lower leaves begin to turn brown and die, and then gradually spread to the upper leaves, flowering is also inhibited, growth is retarded, and yield is low. Remedy: Spray with 0.3%~0.4% magnesium sulfate solution and spray 2~3 times continuously.
Calcium deficiency wheat lack of calcium, mainly in the new leaves, the upper leaves significantly reduced, yellowing between veins, nearly growing point leaves, leaf margin withered, the tip often curved hook-shaped. Remedy: Spray 0.3% calcium chloride solution or 1% calcium superphosphate leachate on the foliage, spray once every 7-10 days, and spray 2 or 3 times.
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