How is grape potassium deficiency symptom?

How is grape potassium deficiency symptom? What causes potassium deficiency in grapes? How to prevent potassium deficiency in grapes? Please also have the experience of grape planting netizens to help introduce Grape is a perennial vine, usually cultivated in greenhouses or equipment scaffolding, which leads to the long time that the vineyard soil cannot be ploughed, and the elements in the soil are deposited or lost, thus forming a deficiency symptom. Today, the planting network sorted out the harm, causes and prevention methods of grape potassium deficiency symptoms, listed in detail below for netizens to refer to. Symptoms of potassium deficiency: Grape in potassium deficiency when the base of the old leaf edge and vein chlorosis, to develop into yellow brown patches, in serious leaf edge was charred; potassium deficiency grape plant short, poor branch growth, brittle and easy to break, disease resistance reduced, fruit small and few, sour taste, poor coloring, grape peel easy to crack, fruit stem browning, irregular maturity, at the same time easy to drop fruit. Reasons for potassium deficiency: Potassium is involved in carbohydrate, nitrogen metabolism and protein synthesis; potassium deficiency generally occurs in vigorous growth period of grapes. K deficiency is serious when available K content in soil is lower than 40 mg/kg. Potassium deficiency occurs when the vineyard soil is fine sandy, acidic and has little organic matter. How to prevent potassium deficiency in grapes: Method 1. Apply organic fertilizer or composted compost to the vineyard; compare common plant ash, decomposed plant straw and other farm manure to improve soil structure and improve soil fertility of vineyard. Method 2. Apply 0.5~1 kg of plant ash or 50 kg of 50% potassium sulfate per mu to the mature grape trees twice, the first time is applied 20 days after the grape blossoms, and every two times is applied before the grape fruit hard core; the application method can adopt furrow application or hole application. Click here to get the book The Role of Plant Ash Method 3. Foliar spraying can be carried out with 3% plant ash leaching solution, 500 times of 50% potassium sulfate solution, 0.2%~0.3% potassium dihydrogen phosphate solution or 0.2%~0.3% potassium chloride solution. Click to get "The role of potassium dihydrogen phosphate""The use of potassium sulfate" Grape magnesium deficiency prevention and treatment methods Grape calcium deficiency symptoms prevention and treatment methods