Abstract
An experiment was carried out at the Agronomy Field Laboratory, Bangladesh Agricultural University, Mymensingh, during July to December 2006 to study the root growth of four Transplant Aman rice varieties as influenced by NPKS fertilization. The experiment was laid out in a split-plot design with three replications. The experiment consisted of four varieties viz. BRRI dhan30, BRRI dhan31, BRRI dhan40 and BRRI dhan41; and four levels of fertilizers viz. 0, 50%, 100% and 150% of the recommended dose of NPKS. BRRI dhan41 had better performance in all root parameters. All root parameters except number of roots hill-1 performed better at high level of fertilizer. The interaction effect between variety and fertilizer level was significant in respect of number of roots hill-1, fresh weight of root (except at 30 days after transplanting (DAT) and 90 DAT), dry weight of root, fresh weight of above ground plant part (except at 30 DAT and 90 DAT) and dry weight of above ground plant part (except at 90 DAT). Keywords: Root growth; Rice varieties; NPKS fertilizer DOI: 10.3329/jbau.v6i2.4816 J. Bangladesh Agril. Univ. 6(2): 235-238, 2008
Highlights
Research works regarding the root system of rice are very limited especially in Bangladesh
The development of root system of the crop plant under field conditions is frequently accompanied by compensatory growth among root numbers, which is attributed to uneven soil environments
Aman rice varieties viz. BRRI dhan30, BRRI dhan31, BRRI dhan40 and BRRI dhan41; and four levels of fertilizer- 0, 50%, 100% and 150% of the recommended dose of NPKS
Summary
Research works regarding the root system of rice are very limited especially in Bangladesh. Root is the main organ of the plant through which it makes contact with the soil for anchorage and absorbing nutrient and water. The amount and rate of nutrient uptake by the plant depend on the ability of the roots to absorb nutrient and water from the soil. It has been pointed out that the fine branching of lateral roots and the frame work of nodal roots, including size and form of the root system, play an important role in enlarging the root surface and performing the function of a root system as a whole, but in different ways and especially their significance differs in functions such as water (Miller, 1986). In order to improve cultural practices and introduce root characters into the breeding program of crop plants, it is important to determine which of the morphological characters of the root system are modified under certain soil environments. The present study was undertaken in order to obtain accurate information on the root system morphology quantitatively and qualitatively
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