The herbivore grasing optimixation hypothesis predicts an increase in aboveground net primary productivity (ANPP) at a moderate grnxing intensity. The hypothesis was tested by gruing controlled densities (0 to 145 individuals/m2) of bigheaded grasshoppers (Aukera &otti Thomas) for short time spans (7 to 13 days) on enclosed swards (0.7 mZ) of blue gramr [(Boutcloucr gruc&j (Willd. ex H&K.) Lag. cx Griffithsl. ANPP of each of 257 experimental enclosures was esthtmted following regrowth by using a standing crop index (the product of mean total blade length per tiller and percent basal cover) after the grazing period and clipping after the regrowth period. ANPP was not signiKcantly reduced by graxing in any of the S short-dumtion grazing experiments. In 2 of the S experiments, ANPP increased significantiy with graxing. In 1 of the other 3 experiments there was evidence for the graxhtg optimization hypothesis.

A nondestructive technique for estimation of aboveground biomass of blue grama [Boutelouu gracilis (I3.B.K) Griffhhs] was designed for use on small sampling units (

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