Soil water and nitrogen regimes in relation to apple orchard management system and application of nitrogen fertilizers

Kopytko, P.G.; Repyashnik, V.A.; Deryugin, I.P.

Izvestiya Timiryazevskoi Sel' skokhozyaistvennoi Akademii 3: 175-178


Accession: 002697037

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Trials were carried out in the Ukraine in a Snow Calville orchard planted in 1967 at 7 x 5 m. The plots were kept either under clean cultivation or under permanent sward in the interrows and the soil was a heavy clay podzolic chernozem. N was applied at 20-40, 40-60 or 60-80 kg/ha, with no N in the controls. Data are graphically presented on changes in soil water content, and changes in soil NO3--N and NH4+-N contents, and tabulated on apple losses during storage. It is suggested that in an orchard of already low productivity (7-8 t/ha) grassing down of the interrows not only had no adverse effect on yield but, with all rates of N fertilization, improved fruit quality and storability, compared with apples from clean cultivated plots.