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<br />
<br />W~~(gIT_
<br />~
<br />
<br />CENTER PIVOT
<br />IRRIGA TION SYSTEM
<br />
<br />
<br />- DESIGN FEATURES -
<br />
<br />. 6 5 B . 10 93. pipe
<br />. Posit! e ball joint pipe suspension
<br />(Gre fer flexibility over rough te ain)
<br />. Light eight "formed steel" cons uttion
<br />(Pravi es greater strength with ess wheel
<br />penetr ion)
<br />~ 100 inch pipe clearance with
<br />. Distance tween towers - 9
<br />(13 towe s per quarter sect"
<br />. 12 foot wh el base - great
<br />. 9.5 x 16" 9.5 x 24"
<br />. 20.60 plated haio
<br />. Reversible is andard
<br />. Manual or aut atle""
<br />. Zinc chromate imer
<br />. One piece contin DUS
<br />*Optional
<br />
<br />Name
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<br />Zip
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<br />andard tires
<br />feet
<br />n)
<br />stability
<br />lotation tires
<br />
<br />ment - towable
<br />en gun shutoff
<br />- enamel finish
<br />cain with idler
<br />
<br />r--- - --------------
<br />WATER EQUIPMENT ENGIN
<br />~ N. 3RD
<br />
<br />Address
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<br />INC.
<br />
<br />COMPANY,
<br />P.O.
<br />o 80151
<br />2.6431
<br />
<br />BOX 5CG
<br />
<br />City
<br />I
<br />,
<br />I 0 Please Send
<br />,'-
<br />
<br />State
<br />
<br />
<br />Information On
<br />
<br />-I
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<br />You may qu ify to read IRRIGATION AGE free of charge
<br />if you irrig ion farm. For details write to: Circulation Dept"
<br />IP.RIGAT N AGE, 1621 Wall Street, Dallas, Texas 75215.
<br />
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<br />I.rnCIEI!(:\'
<br />(cvlltilll/cd from page 10)
<br />:-.low in figure 2, we see the
<br />hiweekly cOllSumptive u.>c and
<br />irrig;ttion cffieic:neies for the
<br />S~lI111' fidd.
<br />~otc that the first application
<br />was l'xtremdv wasteful. With less
<br />than thrce:founhs inch of
<br />depIcted soil moisture on a fi\'e-
<br />fOOl profile, lilC: irrigator applied
<br />almost nine inches of WJle(.
<br />. From this study, we can draw
<br />some praetic:!1 conclusions:
<br />1. Generall\', because of a
<br />misunderstanding of how much
<br />watl'r can be slOrl'd in the soil,
<br />man)' gr:l.Vil)' irrig:nors make this
<br />mistake on their first prcpJanting
<br />or post-pl:lnting application.
<br />2. The second mistake which
<br />is readily app~trent is the ten-
<br />dency to irrigatc by the cdlend.lr.
<br />In thc case of this sugar beet
<br />grower, hc had a set schedule of
<br />watering e\'er)' two weeks,
<br />Langley and Hullb commelH on
<br />this: "Since the actual consump-
<br />tive use starts at a low value.
<br />builds to a peak and then drops
<br />off again, the practice of irrigat-
<br />ing by the calendar results in toO
<br />large and lOO frequent applica-
<br />tions at the beginning and end of
<br />the season and often too few
<br />applications during the peak con-
<br />sumptive uS{" period."
<br />TJ/fUH IS ,I definiu corre/,HiOll
<br />beti.lJan tbe abo~'e finding .md
<br />tbe .It'.,il.lbility of mltri,'11!S to
<br />cbe pllmc .It times of CTuc;dl
<br />bunger. If.lter is che C.lrrier of
<br />11utricnt.: to the pl.mt. BY'lliher-
<br />ing to .I c.z1eud.lr scbedule of
<br />irrig,J(il1g, t;.'C C.11I j,;,.'cll be sbort.
<br />cb.Illgil1g pl.l1/ts 011 botb lIIoiswre
<br />.w.! tbe 1lIltri.'11!S tb.lt moiswrt~
<br />c.I"ies, This is sOnletbil1g to
<br />think .1bOllt.
<br />
<br />What arc the arguments for
<br />higher irrigation efficiencies?
<br />E;..:cess deep pC'rcol3tion, espe-
<br />cially early in the season, leaches
<br />nutrients, with resulting reduc-
<br />tions in yields," Langley and
<br />Robb point out. "It also mal,'
<br />result in waterlogging with atten-
<br />dant vieJd rcduction and the
<br />need f~r providing expcnsin: sub-
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