Document Type : Research articles.
Author
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
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