PHOSPHORUS - USE EFFICIENCY IN CORN CUL TIVARS | ||
| Journal of Soil Sciences and Agricultural Engineering | ||
| Article 11, Volume 30, Issue 10, October 2005, Pages 6481-6491 PDF (3.36 M) | ||
| Document Type: Original Article | ||
| DOI: 10.21608/jssae.2005.238256 | ||
| Authors | ||
| S.T. Abou-Zeid; Y. A. Abd EI-Aal; Nabila H. Bassioni; Amal L. Abd El-Latif | ||
| Soil Science Department, Faculty of Agriculture, Cairo University | ||
| Abstract | ||
| Phosphorus deficiency is one of the principal yield limiting factors for crop production in Egyptian soils. The objectives of this study were to evaluate P-use efficiency in 17 corn cultivars under P-deficient soil and to elucidate some of the putative mechanisms governing P-use efficiency. To achieve this goal, two pot experiments were carried out; in the first experiment the corn cultivars were grown in P-deficient soil at three levels of P (0, 50 and 75 mg P kg-1) for 30 days after planting. Shoot, root dry matter production, P uptake and P-use efficiency of corn cultivars were investigated. The results showed that shoot and root dry matter production and P uptake were significantly affected by P treatments and corn cultivars. Based on dry matter production and P-use efficiency, corn cultivars were classified as efficient and responsive (ER), efficient and non responsive (ENR), non efficient and responsive (NER), and non efficient and non responsive (NENR). In the second experiment, four corn cultivars differing in P-efficiency were selected from previous screening. These were as follows; T.w.C.320 (ER), T.w.C. 324 (ENR), T.W.C. 351 (NER) and S.C. 12 (NENR). The corn cultivars were grown in the same P-deficient soil for 18 days after planting with and without P application. Dry matter production of shoot and root, root- shoot ratio, root length and organic acids concentrations in rhizosphere soil were investigated under P-deficient and P-sufficient treatments. The results of this experiment showed that dry matter production of shoot and root, root-shoot ratio, root length and organic acids concentrations were increased in all corn cultivars under P- deficient treatment. The effects on root dry weight, root-shoot ratio, root length and organic acids concentrations in rhizosphere soil were greater for efficient cultivars (T.W.C 320and T.W.C 324) than for non-efficient, (T.w.C 351 and S.C 12). | ||
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