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Last modified
1/26/2010 12:49:08 PM
Creation date
10/11/2006 11:36:21 PM
Metadata
Fields
Template:
Water Supply Protection
File Number
8276.100
Description
Grand Valley Unit-Colorado River Basin Salinity Control Project
State
CO
Basin
Colorado Mainstem
Water Division
5
Date
1/1/1975
Title
1975 Demonstration Farms for Salinity Reduction on the Colorado River
Water Supply Pro - Doc Type
Report/Study
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<br />~ <br />0") <br />""" <br />,--.. <br />~ <br />-:-") <br /> <br /> <br />,- . <br />-' <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 S'~ate 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 m'.nd 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 May 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 irrigation samples <br />were taken from the Zimmerman orchard. <br /> <br />- 4 - <br />
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