Look at leaf color to fertilize canola
Bulk Goji Powder,Goji Berry Powder,Goji Juice Powder Chocolate Pumpkin Seeds Co.,Ltd , http://www.chgojiberry.com
During the growth of rapeseed, different degrees of discoloration may occur in the leaves due to the lack of certain nutrient elements or adverse external factors. In production, appropriate management measures can be taken according to changes in the leaf color of vegetables. Yellow leaves: Caused by insufficient nitrogen, the leaves of the seedlings are uniformly yellowish green or yellow. Per 100 square meters, 1.5 kg urea or 3 kg of ammonium bicarbonate or 150 kg of human feces and urine can be poured into the water. Red leaves: When the leaves of the seedlings are light red due to insufficient soil moisture, they should be dredged and drought-fighted immediately; excessive rain, damage to the roots, dark red leaves should be drained and drained; the temperature is below 0°C. When it is red when it is frozen, it can be combined with cultivating soil, and 10-15 kg of plant ash can be applied per 100 square meters; when the locust infestation causes redness of the leaves, 80% of dichlorvos can be sprayed to cure pests. Purple leaves: When the soil is deficient in phosphorus, the rapeseed plants grow slowly, the leaf color lacks luster, there are purple-red spots or plaques on the edge of the veins, and the petiole is purple. For every 100 square meters, 3.5-4 kg of superphosphate may be topdressed, or 2-3 times with foliar potassium dihydrogen phosphate 400 times. Brown leaves: Due to lack of potassium, there are yellow spots at the beginning of the leaves, and the edges of the leaves gradually appear as “focal edges†and light brown spots, starting from the old leaves and developing toward the heart, and gradually wither. For each 100 square meters, 1-1.5 kg of potassium chloride or 15 kg of plant ash may be topdressed, or 2-3 times may be sprayed with potassium dihydrogen phosphate 400 times. (Yuhong)