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<br />(:l <br />,~ <br />'.1' <br />..-i <br /> <br /> <br />-, <br /> <br />,~ . ~ <br />-. <br /> <br />~O~ <br />! <br />.~~t <br /> <br /> <br />Attention will be given to early water applications to produce full water <br />capacity in the soil early in the season. <br /> <br />The next several pages contain graphs of the leaf analysis from the Davis <br />orchard. Monthly analysis was performed by the Colorado State University at <br />the Austin experimental station. From the graphs of the leaf analysis the <br />relative amounts of elements can be seen at a glance. <br /> <br />Colorado nutritional standards for peaches have been developed by C.S.U. <br />for the month of July only. You will note that the nitrogen content in many <br />cases was below the standard for July. One must bear in mind that nitrogen <br />additions are risky after July and we are only now beginning to get some idea <br />of the amounts of nitrogen sufficient to obtain the desired results. One <br />quarter of a pound of nitrogen was added per tree last year which was the same <br />amount added at the Zimmerman place. It is certain that there was a good deal <br />of residual nitrogen held over at the Zimmerman place from the year before. <br />The plan this year is to add one third of a pound per tree as early in the <br />spring as possible and then on the basis of the ~lay leaf sample we may add a <br />little more. The May leaf sample should give us about 4.2 to 4.6% nitrogen <br />though we may be able to use a higher nitrogen if the phosphorous and <br />potassium are in balance. <br /> <br />A high nitrogen content is desirable in the spring to promote maximum <br />horticultural performance. However, the nitrogen content should end the season <br />about 2% to insure winter hardiness. According to custom we have added the <br />nitrogen in the fall just before the system was turned off; however, because <br />of the winter hardiness tests conductpd by Dr. Hatch at the Orchard Mesa unit <br />we have decided on early spring ferti lizer applications. Following is an <br />excerpt from his winter hardiness study. The trickle irri:~ation samples <br />were taken from the Zimmerman orchard. <br /> <br />- 4 - <br />