Symptoms Nitrogen Deficiency Nitrogen-deficient Naked Leaves New Leaves Slowly Growth, Leaves Less, Leaves Weak, Gradually Glitter Green, Purple, Reddish Stalks, Severe Scorch-like, Pale Red Veins; Plant Growth Thin, Main Stem Dwarf, slender, loose plant type, few pods, early flowering and short flowering time, early flowering earlier. Phosphorous and phosphorus-deficient leaves were dark blue-green to lavender, with small leaves, thick leaves, no petiole, purplish red spots or patches on the edge of veins, small number of leaves, yellowish and easy to fall off the lower leaves, severe leaf edge necrosis. The old leaves withered in advance, the leaves became narrow, the plants were short, the stems became thin, the branches were few, the plants were thin and upright, the roots were small, the development was poor, the lateral roots were few, and the rapeseed maturity was delayed by 1-2 days. The three-deficient potassium seedlings appeared sickle-shaped, with dark green leaves and small leaves. The leaves were scalded like boiling water, the leaf margin was rolled down, and the foliage was uneven, crunchy and easily broken. Leaf rims or chlorosis between veins, initially showing small spots, followed by plaque necrosis. All severe potassium deficiency leaves withered, but did not fall off. The lack of potassium is first manifested in the vigorous metabolism of the leaves, not easy to see on the old leaves. The potassium-deficient main stem grows slowly and is small and easily broken off. The pods are short and the keratin is brown. Four magnesium deficiency often leaves leaves lacking green, but the veins are still green, the old yellow leaves at its base; flowering is often inhibited, the petals are pale, and the size of the plants does not change significantly. Five-deficient manganese rape is very sensitive to manganese. In the absence of manganese, the young leaves appear yellow-white, veins are still green, and chlorotic spots begin to appear. After the leaves veins are removed, all the leaves turn yellow, and the plants generally grow weakly, yellow-green, and flowering. The number is small, and the number of pods is reduced accordingly. Brassica napus grows incompletely. Sixth, the symptoms of sulfur deficiency and nitrogen deficiency symptoms are basically similar. The seedlings are narrow and yellow, and the veins are green. They gradually spread to the whole leaves and bolting and flowering stems and inflorescence; the pale yellow flowers often turn white, and flowering continues. In addition to mature and immature pods on mature plants, there are flowers and buds. The tip of the pods dry up and about half of the seeds are stunted. The plants are short and the stems are easy to lignify or break. Seven Boron-deficient Brassica napus Lack of boron at the seedling stage, roots brown, new roots less, root neck enlargement, individual root tips with small nodules; stems not long-stemmed white withering; leaves dark green, shrinking, showing purple spots Pieces or all of the leaves are purplish red and cause dead seedlings when severe. The buds are lack of Boron, the buds are withered, the buds are brown, the moss is thin and short, the top buds are chlorosis and withering, the flowers are dark, the petals are shrinking and dry, they are not normally flowering and fruiting, and the flowers are not real, and they are not conducive to the formation of normal pods and young fruits. A large number of shedding, individual malformed development of pods of less pods, different sizes of mature. Eight new calcium leaves withered, the old leaves were yellow; leaf margins, veins white, leaf margins, the top leaf buds bent or died. Nine zinc-deficient rapeseed lack zinc, chlorosis between leaves, leaves slightly thicker, severe leaves all white. Plants generally grow short and grow weakly. Brassica napus flowering was inhibited and completely unreliable.
The cause of a deficiency of nitrogen rape required an appropriate amount of nitrogen fertilizer. According to the experiment, in the medium-fertility plot, based on 6 kg of phosphorus pentoxide of 667m2, nitrogen fertilizer was applied, and the yield increased with the increase of nitrogen application rate. When the yield rose to the highest point, the increase in nitrogen fertilizer reduced the yield. On the basis of production, 667m2 of phosphorus pentaoxide applied nitrogen on the basis of 10kg, 667m2 maximum increase of 67.8kg, production below this level prone to nitrogen deficiency. Phosphorus deficiency
When the content of available phosphorus in soil is lower than 10mg/kg, the average yield of 1.5kg of rapeseed per kg of P2O2 is increased, and the average yield of rapeseed is 3.1kg per kg of P2O2. Under medium fertility conditions, the appropriate amount of phosphorus per 667m2 is 6-7kg, which is 2 times that of general grass crops. Below the standard, phosphorus deficiency symptoms will occur. Potassium deficiency in the tested soil had a soil available potassium content of less than 100 mg/kg in the middle-lower soil fertility level, potassium application increased by 16.1%-20.7%, and oil content increased 5%-12.4%. Potassium deficiency in soil affects yield, quality, and grain weight. However, the effect of increasing potassium production on cinnamon soil is not obvious. Four magnesium deficiency soils contain low levels of magnesium, and sometimes there is no magnesium deficiency in the soil. However, due to excessive potassium application or in the acidic and calcium-containing alkaline soils, the absorption of magnesium by rape is affected. Sometimes plants need magnesium. Large, when the root system is not full
Magnesium deficiency can also be caused when it is needed. The temperature in the early spring in the production is low, especially when the soil temperature is low, it will also affect the absorption of magnesium and phosphoric acid in the root. In addition, partial application of nitrogen fertilizer can also induce magnesium deficiency. Manganese deficiency The viscous, poorly ventilated alkaline earth is prone to manganese deficiency. Sulphur deficiency is prone to the continuous application of sulfate-free fertilizers for the production of six sulfur-deficient products. Seven boron-deficient rapeseeds are most sensitive to boron. The content of water-soluble boron in the soil of most rapeseed production areas in China is less than 0.5mg/kg, which is lower than the conventional critical value of boron deficiency. The content of boron in northern rapeseed area is slightly higher, but it has not reached the standard of 0.5-1mg/kg, 0.5 Mg/kg indicates boron deficiency, and less than 0.3 mg/kg is severely deficient in boron. Eight kinds of calcium-deficient acid soil apply appropriate amount of lime; alkaline soil appropriate amount of gypsum, later spraying 0.2% calcium nitrate. Nine deficient zinc soil zinc content is generally 10-300mg/kg, China's soil zinc content increased pH, effective zinc content decreased, plant zinc deficiency often occurs in the pH> 6.5 soil. In addition, soils containing high levels of available phosphorus or the application of large amounts of phosphate fertilizers often make zinc deficiency worse.
Control methods (1) Nitrogen deficiency plots, promote the application of enzyme composted compost or fully mature organic fertilizer. Promote the application of coated urea, long-acting ammonium bicarbonate, and controlled release fertilizers. In emergency, every 667m2 can be topped with 7-8kg of urea or 15-20kg of ammonium bicarbonate. After topdressing, it is necessary to water after top dressing to prevent burning of seedlings. Promote the application of "Yiyi" microbial active organic fertilizer 300 times or 50-80kg/667m2 Lufeng biological fertilizer application. In addition can also apply Hui Man Fung, Feng Bao Feng, Baofeng harvest and other foliar fertilizer, the application of Hui Man Fung liquid fertilizer, the amount of 667m2 250-500ml, diluted 400-600 times the liquid, spraying leaves 2-3 times. Can also be sprayed with 1%-2% urea aqueous solution 40-50kg. (2) The lack of phosphorus advocates the use of calcium fertilizer coated with fertilizer or 667m2 calcium superphosphate
20-30kg, timely irrigation after application, if necessary, foliar spray Fengbao liquid fertilizer No. 1 400-500 times or foliar injection of potassium dihydrogen phosphate per 667m2200-250g to 50kg water, dubbed 0.4% -0.5% aqueous solution , spray a total of 2-3 times. (3) Potassium deficiency is recommended for the application of silicate bacterial biopotassium fertilizer or 5-10 m2 of potassium sulfate or potassium chloride or 100 kg of plant ash per 667 m2. Can also be sprayed on the foliar potassium dihydrogen phosphate 200-250g water 50kg, dubbed a 0.4% -0.5% aqueous solution. (4) When magnesium deficiency occurs, spray 0.1%-0.2% magnesium sulfate solution to 250kg per 667m continuously for 2-3 times. (5) Manganese-containing compounds are applied when there is a deficiency of manganese. Usually 667m2 manganese 3-5kg manganese sulfate or foliar spraying 0.1% manganese sulfate solution, per 667m 250kg. Continuously 2-3 times. (6) When sulfur deficiency is used in formula fertilization or severe sulfur deficiency, topdressing potassium sulfate 10-20kg per 667m2. (7) When boron deficiency is applied to apply boron fertilizer, apply 21% of high-efficiency instant boron fertilizer (100g) or application of borax 0.5-1kg per 667m2, and reapply to areas with severe boron deficiency, generally mixed with nitrogen, phosphorus and potassium, or 667m2 Need to spray 100-200g of borax 50-60kg of water, continuous 2-3 times. (8) When zinc deficiency is applied, zinc sulfate is applied to each epidemic, and 50 kg of a 0.3%-0.4% zinc sulfate solution is applied per 667m23-4kg or foliar spray.
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