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Secondary & micronutrient fertilizers sources and application

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Secondary & micronutrient fertilizers ( द्वितीयक एवं सूक्ष्मपोषक उर्वरक ):- Secondary nutrients fertilizers (द्वितीयक पोषक तत्व उर्वरक):- The secondary plant nutrients are Ca, Mg and S. Out of these three nutrients, Ca and Mg are added indirectly in soil through fertilizes and soil amendments. Soil contains Ca and Mg as exchangeable and as CaCO3 and dolomite. Normally, it is not necessary apply Ca and Mg fertilizers in soils of India. Formerly, the use of FYM, Ammonium Sulphate and super phosphate sources of S were used and now their use is either restricted or their replacement by other fertilizers which are devoid of S. Therefore, sulphur now becomes necessary to apply in soil because of the following reasons: ( द्वितीयक पादप पोषक तत्व Ca, Mg और S हैं। इन तीन पोषक तत्वों में से Ca और Mg अप्रत्यक्ष रूप से उर्वरकों और मृदा संशोधन के माध्यम से मृदा में डाले जाते हैं। मृदा में Ca और Mg विनिमय हो सकने वाले और CaCO3 और डोलोमाइट के रूप में होते हैं। सामान्यतया, भारत की मृदा में Ca और M...