REFERENCES
- Appa Rao , V. V. , Singh , S. , Sharma , B. D. and Mesh Ram , D. T. 2006 . DRIS norms for sapota in western plains of India. DRIS . Indian Journal of Horticulture , 63 : 145 – 147 .
- Beaufils , E. R. 1971 . Physiological diagnosis: A guide for improving maize production based on principles developed for rubber trees . Fertilizer Society of South Africa Journal , 1 : 1 – 28 .
- Beaufils , E. R. 1973 . Diagnosis and Recommendation Integrated System (DRIS): A general scheme for experimentation and calibration based on principals developed from research in plant nutrition . University of Natal Soil Science Bulletin , 1 : 1 – 132 .
- Beaufils , E. R. and Sumner , M. E. 1976 . Application of DRIS approach for calibrating soil, plant yield and plant quality factors of sugarcane . Proceedings of the South Africa Sugar Technology Association , 50 : 118 – 124 .
- Beverly , R. B. , Sumner , M. E. , Letzch , W. S. and Plank , C. O. 1986 . Foliar diagnosis of soybean by DRIS . Communications in Soil Science and Plant Analysis , 17 : 237 – 256 .
- Bhargava , B. S. 2002 . Leaf analysis for nutrient diagnosis, recommendation and management in fruit crops . Journal of Indian Society of Soil Science , 50 : 352 – 373 .
- Bhargava , B. S. and Raghupathi , H. B. 1993 . “ Analysis of plant material for macro- and micro-nutrients ” . In Methods of Analysis of Soils, Plants, Waters and Fertilizers , Edited by: Tandon , H. L. S. 48 – 82 . New Delhi, , India : Fertilizer Development and Consultation Organization .
- Cate , R. and Nelson , L. A. 1971 . A simple statistical procedure for partitioning soil test correlation data into two classes . Soil Science Society of America Journal , 35 : 658 – 660 .
- Chopra , S. L. and Kanwar , J. S. 1986 . Analytical Agricultural Chemistry , Ludhiyana, , India : Kalyani Publishers .
- Hundal , H. S. and Arora , C. L. 1996 . Preliminary micronutrients foliar diagnostic norms for litchi (Litchi chinensis Sonn) using DRIS . Journal of Indian Society of Soil Science , 44 : 294 – 298 .
- Hundal , H. S. , Singh , D. and Singh , K. 2007 . Monitoring nutrient status of guava fruit trees in Punjab, northwest India through the diagnostic and recommendation integrated system approach . Communications in Soil Science and Plant Analysis , 38 : 2117 – 2130 .
- Jackson , M. L. 1973 . Soil Chemical Analysis , Indian Edition , New Delhi, , India : Prentice Hall of India .
- Lindsay , W. L. and Norvell , W. A. 1978 . Development of DTPA soil test for zinc, manganese and copper . Soil Science Society of America Journal , 42 : 421 – 428 .
- Mourao Filho , F. A. A. 2004 . DRIS: Concepts and applications on nutritional diagnosis in fruits crops . Science Agriculture (Piracicaba, Brazil , 61 : 550 – 560 .
- Nachtigall , G. R. and Dechen , A. R. 2007 . DRIS use on apple orchard nutritional evaluation in response to potassium fertilization . Communications in Soil Science and Plant Analysis , 38 : 2557 – 2566 .
- Olsen , S. R. , Cole , C. V. , Watanabe , F. S. and Dean , L. A. 1954 . “ Estimation of available phosphorus in soil by extraction with sodium bicarbonate. U. S. Department of Agriculture Circular 939 ” . Washington, DC : U.S. Government Printing Office .
- Pathak , R. K. , Pandey , D. , Mishra , A. K. , Hasib , M. and Tandan , D. K. 2003 . “ Aonla production ” . In Extension Bulletin 16 , 1 – 32 . Lucknow, , India : Central Institute of Sub-Tropical Horticulture .
- Pimolaskar , M. and Bhargava , B. S. 2003 . Leaf and soil nutrient norms in mango (Mangifera indica L.) grown in tribal belt of southern Gujarat . Journal of Indian Society of Soil Science , 51 : 268 – 272 .
- Rao , V. K. and Singh , H. K. 2006 . Response of sodicity and salinity levels on vegetative growth and nutrient uptake of anola genotypes . Indian Journal of Horticulture , 63 : 359 – 364 .
- Subbiah , B. V. and Asija , G. L. 1956 . A rapid procedure for the determination of available nitrogen in soils . Current Science , 25 : 259 – 260 .
- Walkley , A. and Black , I. A. 1934 . An examination of the Degtjareff method for determining soil organic matter, and a proposed modification of the chromic acid titration method . Soil Science , 34 : 29 – 38 .
- Walworth , J. L. and Sumner , M. E. 1987 . The diagnosis and recommendation integrated system (DRIS) . Advances in Soil Science , 6 : 149 – 188 .