Show PLAN I 1 FOR soil improvement experiment field fields help to determine beet best order of application of the materials needed n DR nn c a VF 1111 illinois noli ex P ariment station in an where no farm manure was as used the average yearly return from rom the land itself liht pcr pt r acre while 7 was as the return froni a ton of limestone and acs 2 65 firu fl qui 00 1 pounds of phosphate in order to reduce the labor involved the limestone and phosphate are actu actually all applied in larger amounts at less frequent intervals but thus far the rates of application hove have been one ton of limestone and COO pounds of phosphate per acre for each year although after 04 0 4 soil la Is enriched one half halt ur one third these alZa amounts tints pro provide ilde tor for the principles of permanent improvement prove pro trient for moat mot eoll soil types are al ready inell estable established abed they include the uee use of ground limestone for boj correcting rec ting boll soil and arid for eurich enrichment ment in cal cat clum the utilization of nitrogen by proper use of legume crops the application of phosphorus to most soils and the liberation ot of potash from the inexhaustible supply al at read contained in all normal bolls 11 on fomo eolla limestone should be used in order to provide I both oth magnesium and calcium and on certain abnormal eolla soils such as swamp muck and residual sand potassium must also be applied the location and char character aLter of the various arious sol soil types are established by the surveys and analyses an alecs alses and the eoll soil experiment fields help to determine the best order of application ot of the materials needed |