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<br />,':l <br />",;) <br />...... <br />-, <br />'F~ <br /> <br />C:' Control of nitrogen is one of the important elements in successful peach <br />production. If the nitrogen content is too high the peaches won't mature <br />in time for harvest and the tree will loose some winter hardiness. In 1974 <br />one-half pound of nitrogen per tree was added the previous fall so we started <br />the season with 4.7% nitrogen. By July the sample showed we were at the <br />proper level but there was evidence of an excess nitrogen in the lower <br />orchard because some of the peaches didn't mature on time and there was a <br />carry over of nitrogen which affected the winter hardiness. In 1975 the <br />nitrogen started out at 4.1% after a previous fall application of one- <br />fourth pound of nitrogen per tree. This level of 4.1% sel~ms to have been <br />without any noticeable detriment to the trees. The June sample stayed <br />unusually high as compared to 1974. This was probably du,~ to the unusual <br />late cold season that would inhibit the uptake of nitrogen through the trees. <br />Though the July samples were above the Colorado standard there was no <br />apparent ill effect on the peach crop. Final nitrogen samples were about <br />2% in September which is the way we would like to end the season. Phosphorous <br />and Potassium both have an effect on the nitrogen uptake :Ln the leaf samples. <br />For this reason we would like to see a phosphorous of about 0.4% and a <br />potassium of 2.5% at the start of the season. With addition of one-eighth pound <br />of phosphorous and one-fourth pound potassium per tree in April and May one can <br />expect these elements to be within the above limits. <br /> <br />Maintaining the iron content above 80 p.p.m. was accomplished by the <br />addition of Sequesterene 138 10% FE. Starting at the end of May one 5# <br />bag of Iron was added each week until about mid-July. This amounts to <br />about 3.5 to 4.5 pounds of Iron per I,OOO trees. Addition of this amount of <br />iron will reduce the manganese uptake and for this reason one gallon of liquid <br />manganese 2# MN was added through the system at the same time the iron was added. <br />It is apparent from the graphs that we should have been adding some zinc at the <br />same time, though a deficiency of zinc did not show up in the trees and was <br />only noticeable toward the end of the season in the leaf smaples. <br /> <br />I,t+~ <br />Total water consumation for the year was 14.6 acre fE,et or ~AF/acre. <br /> <br />- 14 - <br />