Effect of Seeding Rate and Ga3 Application on Hybrid Rice Seed Productivity under Seed Production Plots

I.S., El-Degwy; Abo-Youssef, M.I.; Mohamed, A.A.; Al-Shenawey, M.A.

doi:10.21608/asejaiqjsae.2010.2307

Effect of Seeding Rate and Ga3 Application on Hybrid Rice Seed Productivity under Seed Production Plots

Document Type : Original Article

Authors

¹ Agronomy Department Faculty of Agriculture, Kafrelsheikh University, Egypt.

² Rice Research and Training Center, Sakha, Kafrelsheikh, Egypt

10.21608/asejaiqjsae.2010.2307

Abstract

Two field experiments were carried out at the Experimental Farm of Sakha Agricultural Research Station, Kafr El–Sheikh Governorate, Egypt, during the two successive summer seasons of 2007 and 2008.The field experiments were conducted to study the effect of seeding rate and GA₃ doses in the hybrid rice seed production plots on growth characters, yield and its components of F₁hybrid rice plants.
The material under this study included the parental lines IR 69625 A as (female line) and Giza 182 (restorer line) to produce the seeds of F₁ hybrid rice (SK 2058 H). A split-plot design with three replication was used. The main plot was devoted to seeding rate of 20, 24and 28 kg seeds/ha, while the GA₃ doses were assigned in the sub plots. Four doses of GA₃ (BERLEX) 300, 350, 400 g/ha and a control treatment (spraying with water) in two spraying times.
The results showed that, Plant height and flag leaf angle were highly significantly affected by the different doses of GA₃ and different seeding rate. The female parent of the hybrid, SK 2058 H, had a wide variation for panicle exsertion. The hybrid seed yield was highly significantly affected by GA₃ application. It was increased by using 300g GA₃/ha, indicating the positive effect of application. The1000-grain weight was decreased with increasing the doses of GA₃ while the application of high doses of GA₃ increased the seed set percentage, but reduced the grain filling rate. The grain yield of the IR69625A was highly affected by the seeding rate and GA₃ applications. Results also showed that using 20 or 24 kg seeds/ha from IR69625A and GA₃ application by the rate of 350 g/ha may be the best combination for hybrid rice seed production.
ased with the progress of the storage period. Coratina had the highest linolenic content at the third week while Manzanillo had the highest content after 4 weeks at 5˚C. There was no effect of the storage temperature or period on fruit lipids content but generally, the fruits that were stored at 20˚C contained lower values.

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