Abstract
A field study was undertaken at Bangladesh Agricultural University, Mymensingh during the season November 2017 to April 2018 to evaluate the effects of plant × row spacings on yield and yield contributing traits of two Boro rice varieties. Two rice varieties viz., BINA dhan-10 and BRRI dhan28 were sown in five plant spacings viz. 25 cm × 15 cm, 25 cm × 25 cm, 30 cm × 30 cm, 35 cm × 35 cm, 40 cm × 40 cm in randomized completely block design with factorial fashion with three replications. Growth performances, yield contributing characters and yield were significantly influenced by varieties and plant spacings. The highest grain yield (8.75t ha-1), straw yield (11.56 t ha-1), biological yield (20.31 t ha-1) and harvest index (43.05 %) were obtained from the variety BINA dhan- 10 sown at planting spacing of25 cm × 15 cm. More number of total tillers hill-1(14.75) and number of effective tiller hill-1 (12.87) were recorded from the variety BINA dhan-10 sown at planting spacing 40 cm × 40 cm. Based on the present study it is suggested that BINA dhan-10 may be grown under 25 cm × 15 cm in order to get maximum grain yield for Boro rice cultivation. SAARC J. Agric., 19(2): 95-106 (2021)
Highlights
Rice (Oryza sativa L.) belonging to Gramineae family is a staple food for about three billion people around the world (Koireng et al, 2019)
From 11.67 million hectares where average rice yield was 3.2 metric ton per hectare (AIS, 2020).While Boro rice is the largest crop in Bangladesh in terms of production i.e. about 20.38 million metric ton Boro rice produced from 4.09 million hectares land with an average yield of 4.15 metric ton per hectare (AIS, 2020)
The lands were prepared, and the plots were laid out on 12 January, 2018.The experimental plots were fertilized with urea, triple super phosphate (TSP) muriate of potash (MOP), gypsum and zinc Sulphate as per recommendation prescribed for those varieties (Table1)
Summary
Rice (Oryza sativa L.) belonging to Gramineae family is a staple food for about three billion people around the world (Koireng et al, 2019). The yield of Boro rice can be increased by maintaining proper spacing with high yielding variety. For getting maximum light interception, average light utilization efficiency and to maximize light distribution in crop canopy, proper planting geometry is important. These parameters indirectly affect the yield of crops (Hussain et al, 2003). Grain may be reduced in narrow spacing as compared to optimum spacing due to increased competition for nutrient and moisture (Das and Yaduraju, 2011) Another important factor is rice cultivars which are generally selected for higher grain yields (Kumar et al, 2013). Keeping in view the above facts, the present study was undertaken to find out the effect of different spacing and genotypes on yield of Boro rice and to find out the interactive effects of planting density and genotypes on yield performances of Boro rice, if any
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