RESPONSE OF POTATO YIELD AND QUALITY TO BIO-ORGANIC MANURES AS AN ALTERNATIVE STRATEGY TO AVOID THE POSSIBLE CHEMICAL POLLUTION OF MINERAL FERTILIZERS | ||||
| Fayoum Journal of Agricultural Research and Development | ||||
| Article 7, Volume 25, Issue 1, January 2011, Page 88-106 PDF (702.58 K) | ||||
| Document Type: Research articles. | ||||
| DOI: 10.21608/fjard.2011.195479 | ||||
 View on SCiNiTO | ||||
| Author | ||||
| Samira E. Mahrous | ||||
| Soils, Water and Environ. Res. Inst., Agric. Res. Center, Giza, Egypt | ||||
| Abstract | ||||
| A field experiment was conducted on a newly reclaimed sandy soil at ElShark Farm, El-Nubaria area, El-Beheira Governorate, Egypt during two successive seasons of 2007-2008 and 2008-2009. This study aimed at evaluating the effect of completely or partial substitution of the recommended N-mineral dose by N derived from bio-organic sources, i.e., organic compost, bioinoculation with N2-fixer bacteria of Cyanobacteria and P-dissolving bacteria of Bacillus megatherium var. phosphaticum + rock phosphate and K-sulphate as well as amino acids as foliar spray on potato tuber yield and quality. The expected amelioration of soil nutrients status was also taken into consideration. This scientific aspect represents a new strategy technique for understanding the best usage of local natural organic manure and active bacterial strains for N or Pbio-inoculation, whether be under demand for agricultural utilization projects in the newly reclaimed areas. It is considered a huge challenge and technical solution for alleviating the possible adverse fears of environmental chemical pollution risks as a result of excessive use of the nitrogenous fertilizers as well as to support the newly approach of “bio-organic agriculture”. To achieve this target, bio-inoculated potato tubers (Solanum tuberosum, L., Lady balfour cv.) were sown under the aforementioned conditions of the experimental soil and applied treatments as solely or combined with amino acids added as foliar spray at the rate of 150 g/100 L/fed. The obtained results indicated that the experimental soil could be classified as "Typic Torripsamments, siliceous, thermic". In addition, the suitability class for irrigated agriculture land could be belong a marginally one (S3s1s4). Also, the resultant adaptations of soil suitability class for cultivating potato plants could be considered as a marginally suitable adaptation (S3s1n for the current and S3s1 for the potential conditions), with soil texture (s1) as a limiting factor. Results indicated that the addition of organic compost into the soil significantly increased the available macro and micronutrient contents. This is more attributed to it represents as a strategic storehouse for essential plant nutrients, which are slow release during their mineralization processes, minimizing their possible lose by leaching process and increasing soil potential of retained nutrients-moisture for grown plants or organisms. Also, application of biofertilizer as inoculated tuber pieces and amino acids as foliar spray significantly increased the availability and mobility of nutrients in the soil as well as their uptake by plant roots and accumulation in potato shoots and tuber tissues. These favourable conditions were positively reflected on vegetative growth parameters, i.e., plant height, Nos. of leaves and branches plant-1 and shoots dry matter plant-1 as well as potato yield and tuber quality throughout ameliorating the values of dry matter %, total carbohydrates %, crude protein % and tuber contents of N, P, K, Fe, Mn, Zn, Cu and B. That was true, since the combined treatment of organic compost, biofertilizer and sprayed with amino acid resulted in a best tuber yield with high quality. So that, it could be recommended that organic manure, P-dissolving bacteria and N2-fixer bacteria strains should be used to face a great problem of chemical pollution of the exportable potato tuber yield due to the excessive mineral fertilizer uses. Hence, such favourable conditions should be enhance continuous agricultural bio-organic system as a slow release nutrients along the growth stages of potato plants, and in turn to minimize its possible nutrients losses, which represent surplus point for sustainable agriculture system. | ||||
| Keywords | ||||
| Potato; organic compost; bio-fertilizer; tuber yield and quality | ||||
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