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Response of ratooning grain sorghum sorghum bicolor to nitrogen fertilizer and insecticides

Response of ratooning grain sorghum sorghum bicolor to nitrogen fertilizer and insecticides

Agronomy Journal 73(2): 298-300

Grain sorghum is ratooned for a 2nd grain crop but production practices for the ratooned crop are not well defined. To evaluate the effects of fertilizer N and insecticides on the production of ratooning grain sorghum (S. bicolor (L.) Moench), field studies were conducted for 2 yr on a Greenville soil (Rhodic Paleudult). N (0-157 kg/ha) was applied immediately after the 1st crop was harvested and a combination of insecticides [methomyl, diazinon] was applied just prior to heading and during the early bloom stage. N uptake, grain size, grain yield and insect population counts were used to determine treatment effects. Leaf N increased with increasing N application rates in 1977. Grain yield did not increase when applied N exceeded 112 kg/ha. Average weight per hundred seed for all treatments was 1.6 g compared with an average of 2.7 g for the planted seed. Insect infestation was high in 1977 and yields of the ratooned crops (averaged over N rates) were 2210 and 1383 kg/ha for the insecticide-treated and untreated areas, respectively. In 1978, leaf N ranged 1.4-2.0% and increased with increasing N rates up to 67 kg/ha. Weight per hundred seed averaged 2.22 and 2.91 g for the insecticide-treated and untreated areas, respectively, but did not respond to applied N. Although insect monitoring revealed no evidence of high densities of phytophagous insects, grain yield averaged 67% higher when insecticides were applied. Yield increased with increasing N rates up to 67 kg/ha in the insecticide-treated area but there was no response to applied N when insecticides were not applied. When averaged over N rates, yield from the insecticide-treated and untreated area in 1978 was 3136 and 1882 kg/ha, respectively. Total grain yield from the planted and ratooned crop (with optimum N and insecticides) in 1978 was 9847 kg/ha. N fertilizer at 67 kg/ha is sufficient for ratooned grain sorghum; the applied N is economical if a well managed insecticide program is followed.

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Accession: 006326534

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