Kumar, VijaySharma, Bhumika2023-12-012023-12-012023-08-21Sharma, B. 2023. Standardization of Diagnosis and Recommendation Integrated Systems for Kinnow Mandarin (Citrus reticulata Blanco) under Jammu Subtropics,M.Sc. Thesis, SKUAST-Jammu, India.37140https://krishikosh.egranth.ac.in/handle/1/5810202007The present investigation entitled “Standardization of Diagnosis and Recommendation Integrated Systems for KinnowMandarin (Citrus reticulata Blanco) under Jammu Subtropics” was carried out in three districts viz., Jammu, Kathua and Samba. Soil and leaf samples were collected and analysed for various soil properties, nutrient status and yield. These KinnowMandarin orchards have shown variation in soil pH from 6.30 to 8.18, EC 0.19-0.67 dS/m, organic carbon 3.00-6.70 (g/kg), soil texture including sand (44.88 to 75.87%), silt (13.11 to 29.31%) and clay (4.65 to 34.88%), N (99.10 to 381.56 kg/ha), P (9.79 to 18.99kg/ha), K (105.28 to 232.98kg/ha), S (7.12 to 14.23mg/kg), Ca (4.01 to 6.32[c mol (p+)kg-1]) , Mg (2.01 to 3.39[c mol (p+)kg-1]), Zn (0.40 to 4.99 mg/kg), Fe (2.49to13.89 mg/kg), Cu (0.42to 1.82 mg/kg) and Mn (0.59to 5.01 mg/kg) and N (1.17-2.53%), P (0.06-0.17%), K (0.80-1.66%), S (0.09-0.38%), Ca (1.20-1.87%), Mg (0.21-0.48%), Zn (17.89-37.81 mg/kg), Fe (155.48-321.78 mg/kg), Cu (15.78-38.47 mg/kg) and Mn (16.47-33.38mg/kg) leaf nutrients and fruit yield (14.89 – 47.78 kg/tree). The correlation studies between soil available nutrients and soil chemical properties showed a positive and significant relationship between soil N and OC and soil Ca and pH. The correlation between available nutrient elements in soil with their respective contents in leaves exhibited significant and positive relationships. The available nutrient in soil and leaves with yield also exhibited significant and positive relationships. Soil fertility norms and leaf nutrient standards derived from DRIS norms for soil and leaf were 181.68-308.95kg/ha, 10.68-17.34 kg/ha, 170.93-221.56kg/ha, 7.92-13.00 mg/kg, 5.25-6.24cmol(P+)kg-1, 2.49-3.26cmol(P+)kg-1, 0.62-4.74 mg/kg, 5.79-10.76 mg/kg, 0.87-1.66 mg/kg, 1.17-4.29 mg/kg and 1.96 to 2.34 %, 0.13 to 0.16 %, 1.46 to 1.63 %, 0.16 to 0.26 %, 1.70 to 1.90 %, 0.30 to 0.40 %, 20.09 to 29.56 mg/kg, 212.51 to 315.13 mg/kg, 25.83 to 37.38 mg/kg and 24.33 to 32.43 mg/kg respectively for N, P, K,S,Ca, Mg, Zn, Fe, Cu and Mn. DRIS approach diagnosed 9.6, 7.01, 4.38, 5.26, 6.14, 7.89, 12.2, 14.03, 8.77 and 21.05 % and 11.40, 6.14, 3.50, 1.75, 0, 5.26, 21.05, 17.54, 15.78 and 8.77 % orchards as major relative deficiency for N, P, K, S, Ca, Mg, Zn, Fe, Cu and Mn and soil and leaf respectively, whereas, sufficiency range identified 15.78, 0, 40.35, 0, 25.43, 15.78, 9.64, 8.77, 5.26 and 0 orchards as deficient for soil and 17.54, 31.57, 34.21, 6.14, 35.08, 12.28, 0, 7.89, 2.89 and 31.57 for leaf for N, P, K, S, Ca, Mg, Zn, Fe, Cu and Mn respectively. DRIS approach diagnosed 0, 1.75, 3.50, 1.75, 2, 0.87, 8.77, 23.68, 17.52 and 38.59 % and 18.42, 28.94, 42.98, 33.33, 45.61, 0.87, 11.40, 28.07, 33.33 and 32.45 % orchards as major relative excess for N, P, K, S, Ca, Mg, Zn, Fe, Cu and Mn and soil and leaf respectively, whereas, sufficiency range identified none of the orchards in excess. DRIS approach identified most deficient nutrient Mn followed by Fe followed by Zn followed by Cu followed by N followed by Mg followed by P followed by Ca followed by S followed by K in soil and Zn followed by Fe followed by Cu followed by N followed by Mn followed by P followed by Mg followed by K followed by S followed by Ca in leaves. Hence, DRIS diagnostic approach along with sufficiency range approach should be used as a guide for fertilizer application of KinnowMandarin tree for better production.EnglishThesis