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<br />('0 <br />00 <br />r- <br />(~ The two highest yields could not be used in this comparison, <br />L~ Schubauer and Hopkinson (1984) utilized a new technique for <br />~) estimating annual p~oduction in a natural and undisturbed <br />estuarian wetland, arriving at interesting but noncomparable <br />results, Valiela, et al (1976) utilized a variety of <br />fertilization treatments and estimating methods, only one of <br />which produced comparable data, <br /> <br />The mean yield for all studies, irregardless of location, but <br />omitting the two highest yields, was 1516 g d~y weight per <br />square meter (6,8 tons) per year; the standard deviation was <br />630. <br /> <br />Figure 6 presents the relationship between yield and latitude, <br />indicating that maximum yield becomes reduced with increasing <br />latitude. This also suggests that the standard deviation of <br />yield declines at the more northe~n locations. <br /> <br />Components <br />an attempt <br />freeze-free <br />relationship <br />so tightly <br />distinction. <br /> <br />of climatic variation with latitude were compared in <br />to dete~mine, from the available data, whether either <br />days or solar radiation was more influential in <br />to yield. As can be seen in Figure 7, the two are <br />correlated, it is not possible to make this <br /> <br />Relationships between yield and freeze-free days, and yield and <br />daily solar radiation are shown in Figures 8 and 9, Both <br />parameters are significantly related to historical yield at the <br />,995 level, as could have been inferred from the previous <br />result. However. the Grand Junction area is contrasted to the <br />Gulf and Atlantic coasts by combining high solar radiation with <br />a limited growth season, It was of interest to determine how <br />the yield projections would compare, dependent upon the <br />controling parameter(s). <br /> <br />2 <br />The below Table VII shows the R, slope, <br />F-values for daily solar radiation, freeze free <br />combination, with respect to yield, <br /> <br />intercept, and <br />days, and their <br /> <br />TABLE VII: COEFFICIENTS OF REGRESSION EQUATIONS FOR YIELD <br /> <br />PARAMETER R2 SLOPE INTERCEPT F-VALUE <br />Daily Solar <br />Radiation (SR) ,214 7,31 -1065 12,01 (1. 44) <br />F~eeze-Free <br />Days (FFD) ,200 6.10 -63.95 11.01 (1,44) <br />Both .216 1.61(FFD) -867.9 5,93 (2,43 ) <br /> 5,57(SR) <br /> <br />23, <br />