Effect of Nitrogen Rate and Stubble Height on Dry Matter Yield, Crude Protein Content and Crude Protein Yield of a Sorghum–Sudangrass Hybrid[Sorghum bicolor (L.) Moench × Sorghum sudanense (Piper) Stapf.] in the Three‐Cutting System

Abstract

In this study, the effects of nitrogen (N) rate (60, 120, 180 and 240 kg N ha−1 applied in three equal dressings at seeding and after the first and second cuttings) and stubble height (7, 14 and 21 cm) on the dry matter (DM) yield, crude protein (CP) content, and CP yield of a sorghum–sudangrass hybrid [Sorghum bicolor (L.) Moench × Sorghum sudanense (Piper) Stapf., cv. Pioneer 988] in the three‐cut system was investigated. The N rate had no significant effect in the first and third cuttings, but in the second cutting DM yields increased significantly with increase in N rate. The highest yield of 9.1 t ha−1 was obtained with 80 kg N ha−1 for the average of 2 years at the second cutting, but no significant difference was found among the 40, 60 and 80 kg N ha−1 rates. CP content and yield were not significantly affected by N rate at the first and third cuttings, but CP content and yield were significantly affected by application of N at the second cutting. Stubble height had a significant effect on CP content at the third cutting. However, it had no significant effect on CP content at the first and second cuttings. Stubble height had a significant effect on the CP yield at the first cutting, but no significant effect on CP yield at the second and third cuttings.

Proximate Analysis of Forage Sorghum Cultivars With Different Doses of Nitrogen and Seed Rate

“…Protein is one of the most costly supplements for livestock; the total amount of protein produced per unit area is one of the most important quality characteristics as suggested by many researchers (Assefa and Ledin, 2001;Lithourgidis et al, 2006;Atis et al, 2012). The result of the current study was in line with finding of Kim et al (2006) and Bhilare et al (2007) who also reported that application of N increased the crude protein yield while some studies showed the contradictory results (Iqbal et al, 2013;Iptas and Brohi 2003) who reported that no significant differences were found by the application of N rate.…”

Influence of Height‐Based Management on Forage Nutritive Value of Four Warm‐Season Forage Grasses

“…In most cases, nutritive value decreased from first to last cut. These findings correspond to the patterns observed in many warm‐ and cool‐season grass studies where nutritive value is highest in young herbage regrowth and declines with maturity (Perry and Baltensperger, 1979; Bosworth et al, 1980; Belesky et al, 1991; Iptas and Brohi, 2003; Nave et al, 2013; Gelley et al, 2016). Correlations between morphological components and nutritive value variables indicated a positive relationship between proportion of lamina and CP content for all species ranging from 0.6967 to 0.8829, which allows us to tie morphology to a key component in determining forage nutritive value.…”

“…In addition, yield and quality factors could be positively influenced under more generous fertilization programs (Perry and Baltensperger, 1979;Kering et al, 2013;Kilcer et al, 2005;Teutsch et al, 2005). However, many studies have documented that low rates of applied N can be successful in producing forage of adequate yields and nutritive value for beef cattle, which met the goal of the present study (Perry and Baltensperger, 1979;Belesky et al, 1991;Iptas and Brohi, 2003;Beck et al, 2015).…”

Comparison of Young Seedling Growth and Sodium Distribution amongSorghumPlants under Salt Stress

“…There are several types of Sorghum plants such as grain sorghum, forage or sweet sorghum, sudangrass, and sorghum-sudangrass hybrids (Iptas and Brohi, 2003), and they have been extensively used for forage production in salt-affected areas (Hedges et al, 1989;Begdullayeva et al, 2007;Khanum et al, 2010). The tolerance to high saline concentrations in Sorghum seems to vary with the genotype, and some studies revealed large genotypic differences in the tolerance to salinity of Sorghum (Maiti et al, 1994;Krishnamurthy et al, 2007).…”