Performance of Elite Aromatic Rice Varieties Under Different Sowing Dates Under Egyptian Condition

Abstract

The obtained results showed that rice plants sown on the second date (May 10 th) surpassed those which sown on the late date of sowing (June 10 th) in plant height, leaf area index, dry matter accumulation (g m-2), tillers number m-2 , panicle number m-2 , number of filled grains panicle-1 , 1000-grain weight, straw yield and grain yield as well as aromatic level in both seasons. There was no significant difference between rice sown on the April 24 th or May 10 th in the most studied traits. Delay in sowing date significantly increased unfilled grains %, protein % and amylose content % in the two seasons. Aromatic rice varieties varied significantly in most measurements of growth, grain yield and yield attributes, in both seasons. Plants of the Egyptian Yasmin variety having the highest values in the most mentioned traits among the other tested varieties in the two seasons. Plants of Egyptian Yasmin in the two seasons and IR 77510 in the first season produced the greatest grain yield with high aroma level. Plants of IR 65610 variety produced the lowest grain yield in the two seasons. Concerning correlation coefficient among studied characters, grain yield had highly significant positive effect with 1000 grain weight and number of grains per panicle and significant positive with number of panicles m-2. It can be concluded that the optimum sowing date of Egyptian Yasmin variety is April 24 th and May 10 th while, sowing date of May 10 th is the one optimum for IR 77510, IR 78530 and IR 71137. Generally aromatic varieties i.e. Egyptian Yasmin, IR77510-88-1-3-3, IR78530-45-3-1-3, IR 74052-177-3-3, IR 71137-51-2 and IR65610-38-2-4-2-6-3 could be recommended to be sown in April 24 th and May 10 th .

Effect of Sowing Dates on Yield and Yield Attributes of Rice Genotpes

“…LU Chuan-gen et al (2007) indicated that among the climatic factors which affected rice spikelet fertility as well as grain yield, the key factor is air temperature. Similar results were also reported by Metwally et al (2012), Rajesh Khavse et al (2015 and Metwally et al (2016). Table 15 presents number of days to heading of the studied rice genotypes under different sowing dates.…”

EFFECT OF SOWING DATES ON RICE (Oryza sativa L.) YIELD AND YIELD COMPONENTS OF (BHUR KAMBJA-1) VARIETY AT SOUTHERN BHUTAN

“…The height of plant shows no statistical significant differences among sowing dates other than 29 July. The height of variety shows decreasing trend with further delayed sowing (14 July and 29 July) in agreement with (Metwally et al, 2012) who reported decreased plant height due to delayed sowing in two rice growing seasons under Egyptian condition. The similar findings were also reported by (Safdar et al, 2013), (Begum et al, 2018), (Walia et al, 2014) and (Ferrari et al, 2018).…”

Influence of Sowing Date on Yield and Yield Attributes of Rice Genotypes and Infestation by Rice Leafminer and Rice Stem Borer

“…Tashiro et al (1999) reported a good seedling establishment when planting rice at early sowing date, to ensure an appropriate temperature during seed germination at seedling emergence. Metwally et al (2012) found that rice plants sown on May 1 st surpassed those grown on June 1 st in most of rice plant characters considered in our investigation. Osman (2019) obtained results in the same line, when 14 rice genotypes were evaluated at the experimental farm of Rice Research and Training Center, Sakha, Egypt.…”

“…In addition, grain filling coincides milder temperatures consequently, good grain quality (Farrell et al, 2003 andPatel et al, 2019). Metwally et al, (2012) and Osman (2019) reported that early rice sowing, early May enhances plant height, number of panicles/hill, number of filled grains/ panicle and rice grain yield.…”