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Control Methods for Nutrient Deficiency Symptoms in Cut Rose Production

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When nutrient elements are lacking, the main causes of nutrient deficiency are generally as follows: differences or errors in the effective ingredient content of fertilizers do not match the actual fertilizer requirement; improper fertilizer blending and application operations cause precipitation and loss, making the nutrient ratio lose balance; factors such as soil pH, soil temperature and poor permeability affect the availability of nutrient elements, so that roses cannot effectively absorb nutrients. Therefore, in soil cultivation, as long as normal fertilization is maintained, deficiencies of major and secondary elements are generally unlikely to occur; sometimes they appear because roses grow fast and consume a large amount

When nutrient elements are lacking, the main causes of nutrient deficiency are generally as follows: differences or errors in the effective ingredient content of fertilizers do not match the actual fertilizer requirement; improper fertilizer blending and application operations cause precipitation and loss, making the nutrient ratio lose balance; factors such as soil pH, soil temperature and poor permeability affect the availability of nutrient elements, so that roses cannot effectively absorb nutrients. Therefore, in soil cultivation, as long as normal fertilization is maintained, deficiencies of major and secondary elements are generally unlikely to occur; sometimes they appear because roses grow fast and consume large amounts of fertilizer and water, and fertilization is not carried out in time, which can be solved by increasing the frequency and amount of fertilizer supply. What is more likely to be deficient are trace elements such as iron, manganese, boron, calcium and magnesium. When iron or manganese is deficient, in addition to increasing the amount of iron fertilizer or manganese fertilizer, more importantly, the soil pH should be adjusted so that the pH value is between 5.5 and 6.5, thereby improving the activity of iron or manganese. In cases of severe deficiency, 0.2% to 0.5% chelated iron or chelated manganese can be used for simultaneous foliar spraying; deficiency of boron, calcium and magnesium is mainly addressed by increasing the amount, and in cases of severe deficiency, boric acid or calcium nitrate can be used for foliar spraying; by applying large amounts of decomposed farmyard manure combined with soil improvement, the occurrence of deficiency symptoms can be reduced. After deficiency symptoms occur, nutrient elements need to be adjusted for 2 to 3 weeks, or even longer. During the adjustment period, soil testing and observation of leaf color changes are required. After the plants resume normal growth, normal fertilizer and water management can be restored.

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