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<br />':..";- <br /> <br />~:) <br />'cj'l <br />'l'"'i <br /> <br />'-.... <br /> <br />Potassium will be added at the rate of one-fourth pound per tree. Though <br />there is an abundance of potassium in these soils it doesn't seem to be available <br />to the trees. The May leaf samples should show us about 2.5% potassium. <br /> <br />Phosphorous seems to be holding at the lower limit of the July standard. <br />With the addition of about one-eighth of a pound of phosphorous per tree the <br />May leaf sample should show .3% or more. If the June leaf samples show excess <br />nitrogen content small amounts (.05 to .10 lb/tree) will be added to reduce <br />the nitrogen. Caution must be used in the use of phosphorous toward the <br />end of the season for an excess of phosphorous will bring the fruit to <br />maturity too rapidly. <br /> <br />Iron will be added through the system at the rate of one 5# bag of <br />Iron Sequestrene 138 each week until mid July. Zinc and manganese will be <br />added a.gallon each at the same time to offset the effect of iron addition. <br />Iron will not exceed the 120 p.p.m. level in anyone leaf sample. If it <br />does a couple of weekly treatments will be omitted. <br /> <br /> <br />'$e1ff:;;....' i <br />.~.:.~'~ <br />~*b'ii <br /> <br />'...... <br /> <br />'~. <br />:".' <br />0;;"_0 :';'::'L" <br /> <br /> <br />'- <br /> <br />" <br /> <br />4 <br /> <br />,~ <br />.~ <br /> <br />Above is a picture of the pump shut off device installed at the Davis <br />place. Several times when the ditch was turned off during the season it <br />worked very well. This is an important feature because the five H.P. motor <br />didn't have a thermal switch to protect it. <br /> <br />This year we installed some salinity sensors along the drip lines and also <br />where the trees were furrow irrigated. The Agricultural Research Service is a <br />partner in this study and they have only started to analyse the data. A few <br />preliminary observations can be made from the weekly readings. They are: <br /> <br />1. Furrow I rrigation tends to drive the salts in toward the <br />tree line. <br /> <br />2. Readings were significantly higher under the Furrow Irrigation. <br /> <br />- 8 - <br />