YIELD AND QUALITY OF SINGLE CUT FORAGE SORGHUM GENOTYPES TO DIFFERENT NITROGEN AND PHOSPHORUS LEVELS
SATPAL, B. S. DUHAN1, U. N. JOSHI, A. S. GODARA2, SATYAWAN ARYA AND NEELAM
Department of Genetics & Plant Breeding
CCS Haryana Agricultural University,
Hisar-125 004 (Haryana), India
(e-mail : satpal.fpj@gmail.com)
(Received : 30 September 2015; Accepted : 5 December 2015)
SUMMARY
A field experiment was conducted at Hisar (Haryana), India during the rainy (kharif) season of 2014 to study the response of different nitrogen and phosphorus levels on the yield and quality of forage sorghum [Sorghum bicolor (L.) Moench] genotypes. Sorghum genotypes SPV 2185, SPV 2191, HC 308, CSV 21F and CSV 30F were planted at 50 per cent of recommended dose of fertilizer (RDF), 75 per cent of RDF, RDF and 125 per cent of RDF, where RDF was 80 kg N and 40 kg P2O5/ha. Among genotypes, SPV 2191 recorded maximum green fodder yield (408.19 q/ha), which was on a par with HC 308, SPV 2185, CSV 30F and significantly superior over CSV 21F (301.85 q/ha). The dry matter yield (109.89 q/ha) was highest under CSV 30F genotype, which was on a par with HC 308 and SPV 2191 but significantly superior over SPV 2185 and CSV 21F. The dry matter yield of CSV 30F was 14.57 and 25.18 per cent higher over SPV 2185 and CSV 21F, respectively. The plant height of CSV 30F (312.33 cm) was significantly higher over rest of the genotypes. CSV 30F took maximum number of days for flowering i. e. 84.30 days, whereas the genotypes HC 308 and CSV 21F completed their duration of 50 per cent flowering after a period of 73 days after sowing. The maximum leaf area index was recorded with SPV 2191 (5.37), which was significantly superior over rest of the genotypes. Among different fertilizer levels, the application of 125 per cent of RDF (100 kg N and 50 kg P2O5/ha) recorded significantly higher green fodder yield (428.47 q/ha), dry matter yield (113.27 q/ha), leaf area index (5.45) and crude protein yield (11.46 q/ha) than other treatments except application of RDF (80 kg N and 40 kg P2O5/ha). The application of 100 kg N and 50 kg P2O5 /ha also recorded significantly higher crude protein (10.15%), in vitro dry matter digestibility (53.06%) and digestible dry matter (60.38 q/ha), which was significantly superior over rest of the treatments. The application of RDF recorded significantly higher TSS (9.83%) which was significantly superior over rest of the treatments. With increasing doses of fertilizers (50% of RDF to 125% of RDF) the HCN content increased from 88.40 to 150.10 µg/g of the fresh weight, respectively. The HCN content at all the treatments was less than the critical limit (200 µg/g of the fresh weight) at 30 days after sowing.
Key words:Dry matter, forage yield, nitrogen, phosphorus, sorghum