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Cate R.B., Nelson L.A., A simple statistical procedure for partitioning soil test correlation data into two classes, Soil Science Society of America Journal, 35, pp. 658-660, (1971)
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Katyal J.C., Sharma B.D., Role of micronutrients in crop production, Fert News, 24, pp. 33-50, (1979)
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Lindsay W.L., Norvell W.A., Development of a DTPA soil test for zinc, iron, manganese and copper, Soil Science Society of America Journal, 42, pp. 421-428, (1978)
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Rathore G.S., Gupta G.P., Khamperia R.S., Sinha S.B., Response of wheat to zinc application in alluvial soils of Morena district, Madhya Pradesh, J Indian Soc Soil Sci, 26, pp. 58-62, (1978)
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Sakal R., Sinha H., Singh A.P., Thakur K.N., A critical limit for the response of rice and wheat to applied zinc in Tarai soil, J Agric Sci Camb, 93, pp. 419-422, (1979)
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Singh K.S., Shukla U.C., Response of wheat to zinc application in different soils of semi-arid region, J Indian Soc Soil Sci, 33, pp. 831-835, (1985)
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Takkar P.N., Micronutrients-forms, contents, distribution in profile, indices of availability and soil test methods, Review of Soil Research in India. Part I, pp. 361-391, (1982)
[9]
Takkar P.N., Nayyar V.K., Response of crops to micronutrient application, pp. 95-133, (1984)