SAC 451 ON FARM ADVISORY FOR SOIL HEALTH.pptx

Soil Science - On Fram Advisory

1. SAC 451 ON FARM ADVISORY FOR SOIL HEALTH , WATER QUALITY & PLANT NUTRITION (0+10) COURSE TEACHERS DR.M.VIJAYAKUMAR Associate Professor (SS&AC) DR.J.BALAMURUGAN Associate Professor (SS&AC)

2. PARAMETERS ANALYSED pH - Jackson et al,1973 EC – Jackson et al,1973 Organic carbon – Wet digestion method,1934 (Walkley and black) Nitrogen – Subbiah and Asija,1956 Potassium – Flame photometer method,1946 CEC – Ammonium acetate extraction method Ca and Mg– Versenate method,1950 We collected 50 soil samples from our college farm (A to H block) .

3. A BLOCK ( Average of soil analytical results of field no.A2,A3,A16,A18,A19,A20,A21,A22,A23,A24) PARAMETERS VALUE INFERENCE RECOMMENDATION pH 6.87 Nearly neutral None EC 0.08 dSm -1 Normal None Organic carbon 0.47 % Low Addition of organic manures such as FYM @ 12.5 t/ha or use green manures and green leaf manures Nitrogen 269 kg ha -1 Low Add nitrogenous fertilizers such as Urea or DAP and also organic products Potassium 166 kg ha -1 Medium Add potassic fertilizers such as MOP or SOP and also organic products Calcium 1.60 c mol ( p+) kg -1 Low Application of gypsum @ 400kg/ha Magnesium 0.80 c mol ( p+) kg -1 Low Application of dolomite lime. CEC 17.90 c mol ( p+) kg -1 Medium Addition of organic manures such as FYM @ 12.5 t/ha or use green manures and green leaf manures .

4. B BLOCK ( Average of soil analytical results of field no. B7,B9,B10,B11,B12) PARAMETERS VALUE INFERENCE RECOMMENDATION pH 6.84 Nearly neutral None EC 0.12 dSm -1 Normal None Organic carbon 0.28% Low Addition of organic manures such as FYM@ 12.5 t/ha or use green manures and green leaf manures Nitrogen 175 kg ha -1 Low Add nitrogenous fertilizers such as Urea or DAP and also organic products Potassium 194 kg ha -1 Medium Add potassic fertilizers such as MOP or SOP and also organic products Calcium 18 c mol ( p+) kg -1 high Skip the fertilizer application for 1 or 2 years Magnesium 6 c mol ( p+) kg -1 high Skip the fertilizer application for 1 or 2 years CEC 21.60 c mol ( p+) kg -1 Medium Addition of organic manures such as FYM @ 12.5 t/ha or use green manures and green leaf manures .

5. C BLOCK ( Average of soil analytical results of field no. C1,C2,C3,C4,C5,C6,C7) PARAMETERS VALUE INFERENCE RECOMMENDATIONS pH 6.97 Nearly neutral None EC 0.1 dSm -1 Normal None Organic carbon 0.74% Medium Addition of organic manures such as FYM @ 12.5 t/ha or use green manures and green leaf manures Nitrogen Yet to be done - - Potassium 156 kg ha -1 Medium Add potassic fertilizers such as MOP or SOP and also organic products Calcium 10.50 c mol ( p+) kg -1 high Skip the fertilizer application for 1 or 2 years Magnesium 8.50 c mol ( p+) kg -1 high Skip the fertilizer application for 1 or 2 years CEC 18.70 c mol ( p+) kg -1 Medium Addition of organic manures such as FYM @ 12.5 t/ha or use green manures and green leaf manures .

6. D BLOCK ( Average of soil analytical results of field no. D1,D2,D3,D4) PARAMETERS VALUE INFERENCE RECOMMENDATIONS pH 6.84 Nearly neutral None EC 0.075 dSm -1 Normal None Organic carbon 0.42 % Low Addition of organic manures such as FYM @ 12.5 t/ha or use green manures and green leaf manures Nitrogen Yet to be done - - Potassium 222 kg ha -1 Medium Add potassic fertilizers such as MOP or SOP and also organic products Calcium 8 c mol ( p+) kg -1 high Skip the fertilizer application for 1 or 2 years Magnesium 6.4 c mol ( p+) kg -1 high Skip the fertilizer application for 1 or 2 years CEC 9.60 c mol ( p+) kg -1 Low Addition of organic manures such as FYM @ 12.5 t/ha or use green manures and green leaf manures.

7. E BLOCK ( Average of soil analytical results of field no. E1,E2,E3,E4) PARAMETERS VALUE INFERENCE RECOMMENDATIONS pH 6.45 Slightly acidic Avoid acidic fertilizers EC 0.02 dSm -1 Normal None Organic carbon 0.11 % Low Addition of organic manures such as FYM @ 12.5 t/ha or use green manures and green leaf manures Nitrogen Yet to be done - - Potassium Yet to be done - - Calcium 9.50 c mol ( p+) kg -1 high Skip the fertilizer application for 1 or 2 years Magnesium 2.50 c mol ( p+) kg -1 Medium Application of dolomite lime CEC 11.90 c mol ( p+) kg -1 Medium Addition of organic manures such as FYM @ 12.5 t/ha or use green manures and green leaf manures .

8. F BLOCK ( Average of soil analytical results of field no. F1,F2,F3,F4,F5,F6) PARAMETERS VALUE INFERENCE RECOMMENDATIONS pH 5.71 Medium acidic Avoid acidic fertilizers , Application of lime @ 7.1 t/ha,  alternate amendments like dolomite, basic slag, flue dust, wood ash, pulp mill lime may also be used on lime equivalent basis . EC 0.01 dSm -1 Normal None Organic carbon 0.55 % Medium Addition of organic manures such as FYM @ 12.5 t/ha or use green manures and green leaf manures Nitrogen Yet to be done - - Potassium Yet to be done - - Calcium 19.16 c mol ( p+) kg -1 high Skip the fertilizer application for 1 or 2 years Magnesium 9 c mol ( p+) kg -1 high Skip the fertilizer application for 1 or 2 years CEC 14.7 c mol ( p+) kg -1 Medium Addition of organic manures such as FYM @ 12.5 t/ha or use green manures and green leaf manures .

9. G BLOCK ( Average of soil analytical results of field no. G1,G2,G3,G4) PARAMETERS VALUE INFERENCE RECOMMENDATIONS pH 6.02 Medium acid Avoid acidic fertilizers , application of lime @ 4.2 t/ha ,  alternate amendments like dolomite, basic slag, flue dust, wood ash, pulp mill lime may also be used on lime equivalent basis . EC 0.01 dSm -1 Normal None Organic carbon 0.33 % Low Addition of organic manures such as FYM @ 12.5 t/ha or use green manures and green leaf manures Nitrogen Yet to be done - - Potassium Yet to be done - - Calcium 5 c mol ( p+) kg -1 high Skip the fertilizer application for 1 or 2 years Magnesium 2.1 c mol ( p+) kg -1 medium Application of dolomite lime. CEC 19.6 c mol ( p+) kg -1 medium Addition of organic manures such as FYM @ 12.5 t/ha or use green manures and green leaf manures

10. H BLOCK (Average of soil analytical results of field no. H1,H2,H3,H4,H5,H6,H7,H8,H9,H10) PARAMETERS VALUE INFERENCE RECOMMENDATIONS pH 6.61 Nearly neutral None EC 0.03 dSm -1 Normal None Organic carbon 0.22% Low Addition of organic manures such as FYM @ 12.5 t/ha or use green manures and green leaf manures Nitrogen Yet to be done - - Potassium 102.32 kgha -1 Low Add potassic fertilizers such as MOP or SOP and also organic products Calcium 13.5 cmol ( p+) kg -1 high Skip the fertilizer application for 1 or 2 years Magnesium 4 cmol ( p+) kg -1 medium Application of dolomite lime. CEC 32.4 cmol ( p+) kg -1 high None

11. WORKS TO BE DONE : Estimation of nitrogen , phosphorous and potassium for left out samples. Estimation of Micronutrients in taken samples. Collection and analysis of water samples in our college. Presentation of remaining theory lectures.