Effects of Sowing Date, Nitrogen and Seed Rate on Wheat Yields in the Sudan Gezira

Khalifa, M. A.

doi:10.1017/s0014479700000193

Cited by 10 publications

(6 citation statements)

References 5 publications

(1 reference statement)

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“…In the late 1960s, when wheat was introduced to the Gezira Scheme, the standard cultivars used were those already grown in the Northern Region of the Sudan which is characterized by longer and cooler winters. Mid-October was the optimum sowing date for those cultivars (Khalifa, 1970), but their grain yields were poor compared to those of the semi-dwarf cultivars introduced more recently. These newer varieties do not yield well from mid-October sowings and do best from November sowing dates.…”

Section: Discussionmentioning

confidence: 85%

The Physiology of Grain Yield in Wheat in an Irrigated Tropical Environment

Ishag

Ageeb

1991

Ex. Agric.

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SUMMARYThe potential yield of wheat and the physiological basis of yield limitation in the lowland irrigated tropics was investigated in three cultivars planted at five sowing dates. Maximum grain yields were achieved by cultivars that flowered in January when the weather was coolest. The period from sowing to terminal spikelet initiation was similar for all varieties and all sowing treatments. The period from terminal spikelet initiation to ear emergence was increased when seed was sown in late November or early December rather than in October or early November. Manipulation of the sowing date in relation to the choice of cultivar had a considerable effect on grain yield.H. M. Ishag and O. A. A. Ageeb: Rendimiento del trigo en las zonas tropicales.

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Section: Discussionmentioning

confidence: 85%

The Physiology of Grain Yield in Wheat in an Irrigated Tropical Environment

Ishag

Ageeb

1991

Ex. Agric.

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“…The recommended seed rate for all varieties of wheat in the different areas of production in the Sudan is 120 kg/ha. Khalifa (1970) and Dafalla & Khalifa (1974) reported that seed rates of 60, 120 and 180 kg/ha gave similar yields with Giza varieties; increases in yield were obtained only when seed rates increased from low levels up to 60 kg/ha. It was considered safer, however, to recommend a seed rate of 120 kg/ha for commercial production where hazards and lower standards of husbandry were expected.…”

Section: Discussionmentioning

confidence: 94%

“…vr .«-,/> o-i 7 ,r.*\ T>-• i. o -n. • from Egypt) and Mexipak (of Mexican origin). The Khalifa, 1970;Singh et al 1971;Kirby & Fans, . 6 J ± \ ' ,* , \ , .…”

Section: Introductionmentioning

confidence: 99%

Yield and yield components of wheat (Triticum aestivum L.) and their interrelationships as influenced by nitrogen and seed rate in the Sudan

Osman¹,

Mahmoud²

1981

J. Agric. Sci.

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Yield and yield components of wheat (Triticum aestivum L.) and their interrelationships as influenced by nitrogen and seed rate in the Sudan SUMMARY Field experiments were conducted for three seasons, 1971-2, 1972-3 and 1973-4 to study the effects of nitrogen fertilizer and seed rate and their interactions on grain yield and its components and attributes of growth of two wheat varieties, Giza 155 and Mexipak. The semi-dwarf Mexipak was found to be more responsive to nitrogen application than the taller Giza 155 in a number of aspects, namely, grain yield per unit area of land, the number and weight of grains per ear, the dry weight per ear and dry weight of ears/m 2 . The numbers of spikelets and grains per ear of both varieties decreased linearly with an increase in seed rate. The 1000-grain weight was not affected in both varieties by either seed rate or N fertilizer. Variety x nitrogen, variety x seed rate and nitrogen x seed rate interactions were significant; the variety x nitrogen x seed rate interactions were not significant. Mexipak was found to have a definite optimum seed rate of 192 kg/ha at an optimum N level of 129kgN/ha for maximum grain yield. Giza 155 was less responsive to changes in seed rate and therefore its optimum seed rate was not as definite as that for Mexipak. Evidence presented here suggests that wheat varieties of different growth habits grown in the Sudan should receive differential treatments when the policies of setting optimum seed rates and nitrogen fertilizer rates are considered.Grain yield of both varieties was positively correlated with total dry weight of shoot at heading. IA on/\ J iu c I y J soil. Urea (46 %) was used as the source of nitrogen * Present address: Regional Office, Ministry of and given in different amounts at sowing. The Agriculture, Kosti, Sudan.nitrogen and seed-rate treatments varied in the

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“…The agronomic studies made in these countries and in the Sudan (Khalifa, 1970) have emphasized the limitation imposed by the short growing season on wheat grain yields. However, the influence of environmental conditions resulting from different sowing dates on the growth of wheat in such environments has been only partly investigated.…”

Section: Introductionmentioning

confidence: 99%

Growth and N-uptake by wheat as affected by sowing date and nitrogen in irrigated semi-arid conditions

1977

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Field experiments were made under irrigated semi-arid conditions to determine the effects of sowing date and nitrogen application on the growth and yield of wheat and nitrogen-uptake by wheat plants. Early sowing was found to be favourable to high grain production because the post-anthesis period coincided with relatively lower temperatures. Late sowing was unfavourable to grain yields since the period between anthesis and leaf senescence was curtailed by the onset of relatively higher temperature. The benefits from nitrogen were greater with early sowing because of higher nitrogen-uptake during early vegetative growth as a consequence of which, nitrogen was readily available to the plants. This resulted in better leaf expansion, and higher leaf-area indices and leaf-area duration. With late sowing nitrogen-uptake was much lower during early vegetative growth and this resulted in decreased leaf expansion, reduced leaf-area indices and leaf-area duration and therefore diminished response in grain yield to nitrogen application.

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Effects of Sowing Date, Nitrogen and Seed Rate on Wheat Yields in the Sudan Gezira

Cited by 10 publications

References 5 publications

The Physiology of Grain Yield in Wheat in an Irrigated Tropical Environment

The Physiology of Grain Yield in Wheat in an Irrigated Tropical Environment

Yield and yield components of wheat (Triticum aestivum L.) and their interrelationships as influenced by nitrogen and seed rate in the Sudan

Growth and N-uptake by wheat as affected by sowing date and nitrogen in irrigated semi-arid conditions

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