"D R I S AND C N C TECHNIQUE IN thesis NUTRIENT SURVEY OF GUAVA (Psidium quajava L.)"
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Date
1993
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Professor Jayashankar Telangana State Agricultural University
Abstract
In a nutritional survey of guava orchards (cv. Allahabad Safeda) located around Hyderabad, leaf analysis interpreted through conventional Critical Nutrient Concentration (CNC) showed inadequacy of N and K in all the orchards. Ca was observed to be deficient in 60 per cent of the orchards. Based on the composition of the high yielding population (>65 kg fruits per plant) Diagnosis and Recommendation Integrated System (DRIS) norms for N, P, K, Ca, Mg and Zn were computed following the technique elaborated by Walworth and Sumner (1987). DRIS indices were computed for each orchard based on the mean nutrient composition of third pair of leaves, which are fully matured. with these indices, the nutrient requirement for theorchards was prioritized. It was observed in thestudy, based on these indices, that N was the most required nutrient in 40 per cent and P in 20 per cent of the orchards sampled. Mg, Ca, Zn and K were the most required nutrients in four orchards (orchards A, B, H and I respectively). Zn and Ca were the leastrequired nutrients in 30 per cent each and P in 20 per cent of the orchards. N and Mg were the least required nutrients in two orchards, viz., F and H respectively.
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D4396