Performance of Some Hybrid Rice Combinations Under Different Irrigation Intervals and Sowing Dates

Abstract

Two field experiments were conducted at the farm of Sakha Agricultural Research Station-Sakha, Kafr-El sheikh governorate, Egypt during 2014 and 2015 seasons to study the performance of some hybrid rice combinations to different dates of sowing and various irrigation intervals. Three hybrid rice combinations, namely; SK-2034H (H1), SK-2046H (H2) and SK-2151H (H3) were used under three dates of sowing (May, 1, May, 15 and May, 30) with three irrigation intervals i.e. every 4 days, every 8 days and every 12 days. A split-split plot design with four replications was used. The three dates of sowing were allocated in the main plots and the three irrigation intervals were devoted in sub-plots, while sub-sub were received the three varieties. The studied characters were light penetrations, leaf area index (LAI), chlorophyll content, crop growth rate, plant height, root depth, number of panicles /m 2 , 1000-grain weight, panicle length, number of spikelets / m 2 *1000, spikelets-leaf area ratio, number of grains/ panicle, grain yield (t/ha) and straw yield (t/ha). The main results indicated that May first followed by May,15 caused an increase in all the previous characters except light penetration and plant height at maximum tillering and late booting. As for irrigation intervals, either irrigation every 4 days or every 8 days were the best for all the studied characters except light penetration and rood depth which reached to the maximum value under irrigation every 12 days. Results also revealed that the hybrid SK-2034 H (H1) surpassed the other two studied hybrids in most of the studied characters and produced the greatest grain yield moreover saved reasonable amount of irrigation water (984,3 m 3 /ha) under 8 days intervals. So it can be concluded that cultivate the hybrid SK-2034 H (H1) hybrid through the first two weeks of May and irrigate it every 8 days intervals was the best combination to get higher yield and save of irrigation water without significant reduction in the yield.

Yield and yield contributing attributes of rice (Oryza Sativa L.) under different planting dates in boro season

“…These results resemble the findings of Akram et al (2007) who reported that the number of kernels panicle -1 was significantly affected as sowing date is delayed. Khalifa (2009) found that early date of sowing (20 th April) is the best time of sowing for the number of grains per panicle and sowing in 1 st June has given the lowest value. Statistically, significant variation was recorded in terms of filled grains panicle -1 due to different rice varieties (Table 1).…”

“…These results are in conformity with the findings of Rizzardi et al (1994) who reported the reduction in 1000-grain weight with the delay in sowing date. Khalifa (2009) found that early date of sowing (20 th April) is the best time of sowing for 1000 grain weight (g) and sowing in 1 st June has given the lowest value. Statistically, significant variation was recorded in terms of weight of 1000-grain due to different rice varieties (Table 1).…”

“…Reduction in panicle length in delayed transplanting from the early one may be due to lack of full photosynthesis during its growing period, the inability of roots to absorb minerals from soil (Kushwaha et al 2016). Khalifa (2009) found that early date of sowing (20 th April) is the best time of sowing for panicle length (cm), and sowing in 1 st June has given the lowest value. Statistically, significant variation was recorded in terms of panicle length due to different rice varieties (Figure 2).…”

“…The maximum number of effective tillers hill -1 (13.33) was recorded from Heera 2, while the minimum number of effective tillers hill -1 (10.50) was found from BRRI dhan29. Khalifa (2009) reported that H 1 hybrid rice variety surpassed other varieties in consideration of effective tillers hill -1 . Murthy et al (2004) recorded a different number of filled spikelets for the different variety.…”

Growth, development and profitability of rice (Oryza sativa L.) as affected by varying growing environments in north Western Himalayas

“…In most of the areas transplanting of rice is normally done between May to July and the effect of this varies from region to region, which in return effects the vegetative and reproductive growth of plant. When crop is transplanted early it produces more tillers, biomass, taller plants, bolder grains with higher 1000-grain weight and grain yield (Khalifa, 2009) [10] . The late transplanting effect the crop by limiting the growth period which in turn reduces the leaf area, panicle length and the mean number of kernels per panicle (Bashir et al, 2010) [2] .…”