[!lemma=farmer] [lemma=□] □
[!lemma=farmer] [lemma=","] □
[!lemma=farmer] [lemma=his] □
This is followed by yellowing of newly formed leaves , sporadic bushy growth , erect growing habit , and stunting . Hence , characterization of the areal and temporal extent of global wetlands would greatly extend our understanding of trace gas exchange from these ecosystems and of their significance to global processes . 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 . At the other end of the fruitfulness spectrum , some varieties are " pollen sterile , " meaning they do not have the ability to pollinate another tree . Example applications include measurement of Greenland and Antarctic ice-sheet elevations ( Thomas et al ., 1992 ; Blankenship et al ., 1993 ) , outlet glacier strains and shape changes due to surge events ( Garvin and Williams , 1993 ; Garvin et al ., in revision ) , and the structural properties of vegetation canopy , such as tree height and biomass ( Aldred and Bonnor , 1985 ; Nelson et al ., 1988 a , b ) .