Comparative study of three different fertilizers types on yield and tubers quality of potato grown in loamy sand soil
2010
El-Shaikh, K.A.A. | Abdel-Ati, Y.Y. | El-Damarany, A.M. | Abdel-Lah, A.A.H.
In loamy sand soil, Potato cv. Diamant was cultivated to study the effect of nitrogen fertilizer (37.5, 75, 112.5 kg N/fed.), biofertilizers (Azotobacter sp., Azosp irillum sp. and mixture of both inoculants) and organic fertilizer at the rates of 10, 15 or 20 tons of compost/fed. on yield and quality of potato. The obtained results indicated that applying three fourth of the recommended dose of N+ Azotobacter sp. + 15 tons compost/fed. increased potato vegetative growth expressed as plant height, number of aerial stems/plant and dry weight of aerial stems/plant. Tubers dry matter percentage was increased with the combined application of one fourth of the recommended dose of N/fed. + mixture of dual inoculants and 10 tons compost/ feddan. However, there were no significant differences on specific gravity trait. The results of this study indicated also that N and K percentage were increased with half of the recommended N dose + mixture of Azotobacter sp plus Azospirillum sp. and 20 ton/fed + 15 tons/fed compost, respectively. However, there was no significant effect on P percentage. NO3 concentration was decreased by applying one fourth of the recommended N dose + Azotobacter sp. + 15 tons/fed., compost. When applying one fourth of the recommended dose of N, Azospirillum sp + 10 tons/fed compost, led to decrease NO2 concentration in tuber. Moreover, the most favorable treatment was applying half of the recommended N dose + Azotobacter + 10 tons/fed compost which achieved significant increments in total tuber yield (tons/fed.) and weight of tubers/plant (g) and recorded low values of NO3 and NO2 in tuber tissues in both seasons
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