Effect of a plant growth regulator on the production and quality of elephant grass pennisetum purpureum

De Lucia Silva G.R.

Veterinaria (Mexico) 19(3): 225-230

1988


ISSN/ISBN: 0301-5092
Accession: 007238604

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Abstract
Elephant grass is a common forage species in the humid tropic, however, it presents a seasonal growth pattern: producing high quantities of forage in the rainy season, with a consequent decline in its quality, both before and after flowering. N-(2,4-dimetil 5 (trifluorometil-sulfonil)-amino-fenilacetamide), a plant growth regulator, can inhibit seed-head production and increase forage quality. The experiment was conducted in the north central region of the state of Veracruz, Mexico with an Af (m) w" climate (e) host humid and acid soils (ultisols). The experimental design was a completely randomized with two replications, the treatments were arranged as a split plot. The main plots (3) were at levels of 0, 250 and 500 g of active ingredient of product/ha and the sub-plots (3 + witness) were the age of the material which was determined by the cut date: just before application of the product (as a test treatment) and at 20, 40 and 60 days after application. The grass was sown May 22, 1983 and on October 2, 1983 the first inflorescence emerged and the product was applied the next day. The dry matter percentage increased with the age of the forage for all of the treatments, from the control (23.6%) to the treated with 500 g and at 60 days (28.3%). The average dry matter production, of each of the three levels of active ingredient, were 42.3, 38.6 and 44.7 t of dry matter/ha respectively. The percent of crude protein diminished with age of forage: 4.29, 4.16, 3.26 and 2.44 for the control, 20, 40 and 60 days respectively. In terms of crude protein, there was no positive effect with the application of this product.