Ogunlela, V.B. and Oyejola, B.A.
(1991)
Comparative response of photoperiod sensitive and insensitive sorghum (Sorghum bicolor L. Moench) varieties to delayed sowing in a semiarid tropical environment.
Der Tropenlandwirt, Beiträge zur tropischen Landwirtschaft und Veterinärmedizin, 92 (2).
S103-S114.
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Abstract
Field trials were conducted at Samaru, Nigeria during the 1981 and 1982 cropping seasons to study the yield and growth responses of photoperiod-sensitive and insensitive sorghum varieties to delayed sowing. Six sowing dates at 10-day intervals were compared each year starting in mid-June. Grain yield of the photoperiod-sensitive variety (L.187) declined b: 82437% when sowing was delayed by 40-45 days. The photoperiod-insensitive variety (HP3) was less responsive to delayed sowing. Greater grain yield in early-sown var. HP3 was at the expense of grain quality. Straw yield and grain number declined in var. L.187 in response to delayed sowing but not in var. HP3. Number of panicles, weight per panicle, grain weight per panicle and panicle length declined in both varieties but more so in var. L.187. Severe shootfly infestation in late-sown crops, particularly in var. L.187, was associated with heavy yield loss. Photoperiod-insensitive sorghum headed and flowered later in late-sown than in early-sown crops. If photoperiod-sensitive late-maturing sorghum varieties are to be grown, it is advisable that sowing be done as soon as the rains are established
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