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When planting new materials , choose those which have resistance to powdery mildew , and space them far enough apart to allow good air circulation and adequate light . The seed from a Haralson apple will produce an apple tree , but it will not produce a Haralson apple tree . What has not yet been achieved , but is possible in principle with accurate space-based data , is a complete mass balance of fluxes of both water and sediment through a drainage basin . By this we mean that , within a given pixel , the position of radar scatterers has not changed to any significant degree , but the ensemble of scatterers ( i.e ., the entire ground surface within that pixel , as well as some adjacent ones ) has moved up , down , or sideways in some correlated fashion . Training primarily consists of bending young , flexible branches that are growing vertically into more horizontal positions , toward an optimal 60 degree angle from the main stem .