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Effect of Site Class and Rainfall on Annual Range Response to Nitrogen and Phosphorus

Luebs, R.E. and Lagg, A.E. and Brown, M.J. (1971) Effect of Site Class and Rainfall on Annual Range Response to Nitrogen and Phosphorus. Journal of Range Management. 24(5):366-370.

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Maximum forage yield increases from application of
fertilizer to annual range in southern California were in
the following order according to site class: swale > gentle
slope > open slope. The increase in forage yield per pound
of applied nitrogen was greatest for low rates of nitrogen
at the slope sites and for a much higher rate at the swale
site. Residual effect of fertilizer on forage yield, measured
the second and third year after application, partially compensated
for a first-year lack of response at lower producing
sites or during low rainfall years. Yield increase the second
year after application of 60 lb. of nitrogen and 26 lb. of
phosphorus per acre was 50% of the increase from the same
application that year. Range site class and fertilizer residual
effects are significant factors in fertilizer application
programs on annual range in lower rainfall areas with high
annual rainfall variability. Annual range soils that are
deficient in available phosphorus by soil test require that
the more limiting nitrogen deficiency be corrected before a
forage yield response to phosphorus will be obtained.

Item Type: Article
NWISRL Publication Number: 0190
Subjects: Mass Import - unclassified
Depositing User: Dan Stieneke
Date Deposited: 20 Nov 2010 21:51
Last Modified: 24 Feb 2017 19:53
Item ID: 204