Soil Fertility and Damage by Chilo zonellu/ to Grain Sorghum

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Date
1971
Authors
STARKS,K. J.
SCHUMAKER,G.
EBERHART,S. A.
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Abstract
Two field trials were done in Uganda in 1968 to study the influence of soil fertility (levels of nitrogen and phosphorous Fertilizer) on the damage caused by Chilo zone/Ius(Swinhoe) to grain sorghum by comparing treated(endosul£an) and borer-infested plots. The number of sorghum heads and the plant height increased with increasing Amounts of fertilizer, but borers decreased both of these measurements. Also, phosphorous fertilizer tended to shorten the flowering period, but nitrogen fertilizer and borers extended it. Stand and number of stalks were not influenced by borers, perhaps because the infestation came late in the season, but there were about 3 times as many seedless heads in infested plots as in treated plots. More borers per plot were found when phosphorous fertilizer was used. Both fertilizers contributed to increased yield of grain, but borers prevented a maximum response to soil fertility.
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The Economic Journal, 64 (No 3), p. 740-743