Abstract
An experiment was conducted at the Agronomy Field Laboratory, Bangladesh Agricultural University, Mymensingh during April to July 2012 to examine the effect of plant spacing and nitrogen level on the growth performance of short duration transplant Aus rice (cv. Parija) under irrigated ecosystem. The experiment comprised four plants spacings viz., 20 cm × 20 cm, 20 cm × 15 cm, 20 cm × 10 cm and 15 cm × 15 cm and four nitrogen levels viz. 0, 35, 70 and 105 kg N ha-1. The experiment was laid out in a Randomized Complete Block Design with three replications. Morpho-physiological characters, of transplant Aus rice (cv. Parija) significantly influenced by spacing of planting, nitrogen level and their interaction. At 60 DAT, the highest plant height (80.68 cm) was obtained at 20 cm × 15 cm spacing fertilized with 70 kg N ha-1 which was as good as 20 cm × 10 cm fertilizad with 35 kg N ha-1. The maximum number of tillers hill-1 (15.16) was obtained at 20 cm × 20 cm spacing fertilized with 105 kg N ha-1which was statistically at par with 20 cm × 15 cmfertilized with 70 kg N ha-1. The highest total dry matter (8.92g) was obtained at the 20 cm × 15 cm spacing fertilized with higher dose of nitrogen (105 kg N ha-1) and at 45-60 DAT, the highest crop growth rate (3.34) was obtained at 15 cm × 15 cm spacing fertilized with 35 kg N ha-1 while the lowest CGR (1.12) was recorded at the same spacing (15 cm × 15 cm) with control treatment. This study revealed that short duration transplant Aus rice cv. Parija can be cultivated at 20 cm × 15 cm or 15 cm × 15 cm spacing with 35 to 105 kg N ha-1 for proper growth.
Highlights
Rice (Oryza sativa L.) is the most extensively cultivated crop in Bangladesh and the staple food for her people
Plant height of transplant Aus rice increased with increased growth duration up to 60 days after transplanting (DAT) (Table 1)
The interaction of different spacing and nitrogen levels did not produce any significant effect on plant height at 30 DAT
Summary
Rice (Oryza sativa L.) is the most extensively cultivated crop in Bangladesh and the staple food for her people. In respect of area and production it ranks fourth among the rice producing countries of the world (FAO, 2009). Aus rice of the country covers an area of 1018623 ha with a production of 2288000 metric tons (BBS, 2016). The growth, yield and yield components of rice are greatly influenced by plant spacing. Under wider plant spacing farmer could not get desired hill per unit area which reduces growth and as well as yield of rice. Proper spacing may help receive maximum light interceptions to enhance photosynthesis as like as growth and yield of rice (Jahan et al, 2017). Nitrogen is the most essential element in determining the growth and yield of rice production. Soil of Bangladesh is not properly enriched with different nutrients, especially nitrogen for growth and development of plant. The selection of the most appropriate levels of nitrogen fertilizer is a major concern offering economic
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