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The quality of the fruit from these disease-resistant trees is acceptable , although it may not measure up to that of some other varieties recommended in Table 1 for zones 4a and 4b . Both passive microwave and active microwave ( SAR ) techniques have provided solid theoretical and experimental results that the top five cm of soil moisture can be measured from aircraft and space platforms under a variety of environmental conditions and through a moderate vegetation cover ( Figures 3-1 , 3-2 ) . Examples of SAR imagery and analysis are presented to illustrate results ; these images are only representative and are not necessarily major developments in and by themselves . Unlike most plant pathogenic nematodes , foliar nematodes live in and feed upon the aerial portion of the plant . A number of modeling studies have demonstrated the sensitivity of soil moisture anomalies to climate ( Walker and Rowntree , 1977 , Rowntree and Bolton , 1983 , Rind , 1982 , Shukla and Mintz , 1982 , Delworth and Manabe , 1989 ) . It is true that the detail offered in higher resolution SAR data is interesting , however , it does not seem to be really needed except for mapping and other less time critical analyses .