Effect of mowing numbers and cutting height on growth and forage yield of sorghum cultivar Giraffa grass

Abstract

A field experiment was carried out in Al-Muthanna Governorate during the summer season 2021-2022. It included a study of the effect of two treatments of mow (cut one, cut twice) and four levels of cutting heights (5, 10, 15, and 20) cm on the growth and yield of forage white sorghum variety Giraffa grass. The experiment was applied according to the design of sectors. The complete randomized R.C.B.D with three replications, the response of the variety Giraffa grass to the number of weeds and cutting heights was estimated by measuring some growth characteristics, as the results of the analysis showed that the mow treatment (cut twice) was significantly superior by giving the highest average of the characteristic of the number of tillers.m-2 , the ratio of leaves to stems (%), and the yield of green and dry forage (tons.h-1 ) were 150.0 tons of m-2 , 41.51%, 19.14 tons.h-1 , and 1.53 tons.h-1 , respectively. As for the treatments for cutting heights, it was observed that the treatment was superior to 10 cm in the characteristic of plant height (cm) and the number of pruning, while the treatment was superior to 5 cm in the characteristic of dry forage yield (ton.h-1 ) and the ratio of leaves to stems (%) was 1.55 tons.h-1 and 34.72%, respectively, while the two cutting treatments were superior to 15 cm and 20 cm, giving the highest average yield of green forage, which reached (16.41 and 16.09) tons.h-1 , respectively