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Discrimination of rapeseed deficiency
In the period of growth and development of rapeseed, if nitrogen, phosphorus, potassium, boron, sulfur and other nutrients, will directly affect the yield. For this reason, some technical remedies for the deficiency of rapeseed are essential. 1. Once nitrogen deficiency rape is found, the synthesis of protein in plants will be hindered, and the content of chlorophyll will be reduced. However, the continuous accumulation of carbohydrates will lead to the formation of anthocyanins, which will turn the old leaves into red gradually. Leaf development. Symptoms: The leaves of the red leaves have yellow color, weak growth, and short plant growth. Prevention measures are: topdressing 5-7 kg of urea or 15-20 kg of ammonium bicarbonate per mu or 5-7 kg of human waste water. Second, the symptoms of phosphorus deficiency: rape grows slowly and dwarf, leaves become smaller, leaf thickens, dark green or gray leaf color, dull, purple petiole, plant malformation, purple veins spots or plaques edge of veins, twitching slowly , red hair. The remedy is: spraying 50-75 kilograms of 2% superphosphate calcium leaching solution per acre, and 25-30 kilograms of superphosphate can also be used. Third, the lack of potassium rape if the lack of potassium, symptoms from the beginning of aging, to the heart of the development. The yellow spots initially appeared. The leaf edges of the leaf tip appeared gradually with "focal edges" and pale brown spots. The leaves were thick and hard and brittle, and the mesophyll was obviously "scald-like". As a result, wilting appeared. These tissues were still dead after the death. Keep brown. Therefore, apply 8-10 kilograms of potassium chloride or 75-100 kilograms of ash per acre. 4. The most obvious symptom of boron deficiency and boron deficiency is "flowering but not real." That is to say, only flowering at the later stage, the seed cannot develop or a few abnormalities develop. At this time, if these symptoms occur, it is too late and should be remedied before the first flowering. Seedling boron deficiency: leaf thickening, rewinding, uneven development, dark green leaves, lack of boron buds: bud withered, color is not green, brown, slow growth, short stems and small stems. Before the beginning of flowering, it was found that rapeseed was deficient in boron, and 15-20 kg of borax was used to spray 50 kg of water per mu. It was better to spray it once every 7 days. 5. Symptoms of sulfur deficiency: Protein content was significantly reduced, chlorophyll formation was affected, leaves were yellow-green, plant growth was poor, and empty pods were numerous and yield was low. The discovery of rapeseed sulfur, 10 kg of gypsum powder per acre can be applied in combination with cultivator, the effect is good.