The effect of soil acidity on crop and pasture production

Contents: 1. Summary. 2. Details of research. 2.1 Problem definition glasshouse trial. 2 (a) Vegetative yield affected by topsoil acidity. 2 (b) Root growth in acid subsoil . 2.2 Field Trials. (a) Wheat - Grain yield - Vegetative Growth. (b) Clover. (c) Acidification of soils from the use of nitrogen fertilisers 3. Appendices - trial data. Summary: 1. Problem defining glasshouse trials on soil from 12 sites were conducted in summer/autumn. Results showed that the components of soil acidity affecting wheat growth... 2. The lime and molybdenum requirements of wheat and clover were examined at the sites from which soil came for the glasshouse trials. 3. Calculations of potential acidification rates from the use of nitrogen fertilisers were made- 80GL7, A short summary has been prepared. For those wishing more detail a full report follows the summary. Appendices containing all data from the trials follow the report. Summary: 1. Problem defining glasshouse trials on soil from 12 sites were conducted in summer/autumn… 2. The lime and molybdenum requirements of wheat and clover were examined at the sites from which soil came for the glasshouse trials… 3. Calculations of potential acidification rates from the use of nitrogen fertilisers were made… Details of research: (1)Problem definition - glasshouse trials: (a) Vegetative growth affected by topsoil acidity: 80GL7 Wilroy - 80GE5, Perenjori - 79TS1, Kalannie - 80M04, Kalannie - 80M05, Merredin – (80MI paddock), Bencubbin - 80ME3. Merredin - GL7 (a) (80MI virgin), Yealering – 80N4. Perenjori - 80TS6. Trayning - 80ME4.Gutha - 80GE6. Darkan - 80NA3. Effect of lime and molybdenum on vegetative and grain yield of wheat at eleven sites: 80TS6, 80ME3, 79TS2, 79GE10, 80M30, 80MO4, 80M30, 80MO5, 80GE6, 80GE5, 80ME4, 80NA4. 1. Methods: 1.1 Soil Analysis. 1.2 Nodule rating system. 1.3 Pasture rating (80M29, 30, 31). 2. Glasshouse trials:. 2.1 80GL7 and 7a Soil acidity investigations . 2.2 80GL13 Subsoil acidity and root growth . FIELD TRIALS, PAGE NO. 3.1 80GE5 18 3.2 80GE6 22 3.3 79GE10 27 3.4 80ME3 31 3.5 80ME4 36 3.6 80NA3 41 3.7 80NA4 45 3.8 80M04 48 3.9 80M05 53 3.10 79M027 59 3.11 80TS6 60 3.12 79TS1 65 3.13 79TS2 68 3.14 80M30 70 3.15 80M29 75 3.16 80M31 78 3.17 80Ml 81 3.18 80N3 82 3.19 80WH3 83