Abstract
Field experiment was carried out during the spring and fall seasons of 2019 at the Abu Ghraib Research Station of the Agricultural Research Office/ Ministry of Agriculture, was aimed to investigate the effect of plant growth inhibitors on growth and yield of several sorghum varieties .Randomized Complete Block Design within split plot arrangement with three replications was used. The main plot consists of three growth inhibitors (Cycocel, Ethiphon, and Mebiquat), which were added at stages six and eight leaf stage, in addition to the control treatment (distilled water only), the sub plot was included three cultivars (Mabrouk, Buhooth 70 and Giza 113). The results showed in both seasons significant interaction between cultivars and growth inhibitors in most of the studied traits. The plants of the variety Giza 113 sprayed with Ethiphon recorded the lowest period of reaching physiological maturity, the highest average dry matter yield, and the highest weight of 1000 grains (89.00 days, 17.32 ton ha-1, and 39.33 gm) respectively. The same variety recorded the highest content of chlorophyll in the leaves and the highest grain yield due to the effect of Mebiquat (49.50 spad, 3.93 ton ha-1. The cultivar Buhooth 70 with the effect of Cycocel achieved the highest average of dry matter yield of 33.27 ton ha-1.
Highlights
Sorghum (Sorghum bicolor (L.) Monech( is one of the cereal crops able to grow at different environments due to its physiological and morphological characteristics, and that the main use of this crop in most producing countries, especially developing countries, it is food for human in various forms, as for the developed countries, the use of sorghum grains for animal feeding, and its important forage crop (7)
The main plot consists of three growth inhibitors, whereas the three cultivars allocated to the sub plots
The results indicated that the cultivars were growth inhibitors added in this trait
Summary
Sorghum (Sorghum bicolor (L.) Monech( is one of the cereal crops able to grow at different environments due to its physiological and morphological characteristics, and that the main use of this crop in most producing countries, especially developing countries, it is food for human in various forms, as for the developed countries, the use of sorghum grains for animal feeding, and its important forage crop (7). The cultivar Giza 113 with the effect of Ethiphon achieved the highest mean which reached 17.32 ton ha-1, while the the two cultivars Giza 113 and Buhooth 70 in cultivar Mabrouk decreased significantly due this character may be due to their superiority in plant height (Table 2), and these results are to the effect of Cycocel and recorded the lowest mean reaching 6.23 ton ha-1 in the in agreement with results of Macedo et al (11).
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