تأثیر منبع و مقدار کود آلی بر کارایی مصرف آب ذرت در سطوح مختلف فشردگی خاک

Soil compaction is one of today's agricultural problems and causes damage to the crops and their production. The use of organic matter as fertilizer on agricultural soils can reduce the effects of soil compaction. In addition, it provides the nutrients needs by the plants. So, a factorial experiment was carried out in a randomized complete blocks design with three replications. The first factor was the source and the amount of the organic fertilizer (manure, sewage sludge compost and municipal solid waste compost) and each of organic fertilizer was used at three levels of 0, 15, 30 g/kg soil. The second factor was two levels of soil compaction (1.2 and 1.7 g cm-3)g. The results showed that the addition of all three types of organic fertilizers at both levels of compaction caused an increase in plant dry matter, leaf length, leaf relative water content and water water use efficiency (WUE). The maximum amount of these features was achieved by application of organic fertilizers at the rate of 30 g/soil. Using organic fertilizers and increasing their amounts, reduced the effects of soil compaction on corn growth characteristics. In order to increasing of WUE and corn growth, application of 30 g of organic fertilizers per kg soil can be recommended at compacted and non-compacted conditions.