<b>Influence of inter row spacing and plant densities in cultivate of sorghum on cutting management</b>

Abstract

The cultivation of sorghum in management of cutting is little studied, considering its importance of use in the feeding of ruminants. This work aimed to evaluate the associative effect of spacing between rows(30, 50 and 70 cm), plant densities (300, 450 and 700 thousand plant ha^-1) and periods (50, 85 and 125 days of plant) of the productive and qualitative potential of cultivated forage sorghum, on cutting management. The forage production increased linearly with the increase in inter row spacing independent on the plant densities, in the proportion of 103.9 kg ha^-1 of dry matter (DM) for each increase of 10 cm in inter row spacing. No significant interaction (P>0.05) was observed between spacing between rows and plant densities for FND, FAD and LIG of sorghum plant on cutting management, just as no significant interaction (P>0,05) was observed between period of utilization of sorghum matched with the factors spacing between rows and plant densities for FND and LIG of sorghum plant. The FND and LIG contents decreased linearly with the increase of spacing between rows, independent on plant densities on the proportion of 0.34% and 0.32% of DM for every increase of 10 cm in inter row spacing. The change of 30 to 70 cm caused larger dry matter production, without changing plant structural composition, just as reduced the ADL and NDF values. The plant densities did not affected the production plant composition and nutritional value of sorghum plant on court regiment.