Effect of dolomite- and lime treatment on some quality parameters of Jonathan apples
1989
Papp, J. | Aziz, A.H. (University of Horticulture and Food Industry, Budapest (Hungary). Dept. of Pomology)
On a sandy soil of poor magnesium status the effect of dolomite- and limestone dust treatments on the skin colour, firmness of flesh, total sugar and acid content and Thiault's quality index of apples was studied at the time of harvest and at the end of storage. Treatments with 2 and 4 t/ha dolomite and with the limestone dust depended the skin colour of the apples. In most years the dolomite and limestone dust treatments also increased the firmness of the apples compared to the control. No tendency-like effect of the treatment on the total sugar content of the apples could be observed. In the majority of the experimental years the 4 t/ha quantity of dolomite and the lime treatment increased the acid content of the apples by the time of harvest, but at the end of storage the acid content both in the dolomite and lime treatment decreased at a higher rate than in the untrated control. On the average of the experimental years the apples in the 4 t/ha dolomite and in the lime treatments showed significantly higher quality index values at the time of harvest. There was no close correlation between the Mg content of the soil and the flesh firmness, acid content and quality index of the fruits. A significant correlation was found, on the other hand, between the Mg content of the soil and the Mg and Ca content of the apples.
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