Assessment of influential soil properties in irrigated rice domain of Bangladesh by GIS: a case study.

摘要: Influential soil properties assessment study was conducted for field-crop management of irrigated rice domain in Bangladesh considering the potential productive capacity and following site specific nutrients technique by using GIS techniques. Research investigation carried out 100 plots from five land blocks four types winter-irrigated (Boro) / Fallow after-monsoon (T. aman) rotation analyzing physical (texture, % sand, silt, clay, bulk density porosity), physicochemical (pH SOM-soil organic matter) chemical/nutrients (N, P, K, S Zn) properties. Geo-referenced composite samples were collected a plough depth 0-15 cm at rate 3.22 ha per sampling along with scale 1: 50,000 10m ×10m pixel size. maps created interpretation, analysis, modeling scenario. Geographically, area is located between 2432'44 2436'41 north latitude 9022'47 9028'45 east longitude. Out medium highlands covered 53% whereas highland, lowland areas 26%, 13% 8% respectively. Whole fallen under three texture groups, which group 68%, moderately fine 19% areas. Clay content range 9% 47% 97% indicated suitability production system. Except percentage sand content, significant difference observed other among types. Higher amount clay has influence on water holding reduces nutrient leaching. Very acidic to pH 92% area, condition also favorable production. Medium (1.4% 2.3%) SOM 82% area. Overall status poor, possessing 75% low (less than 0.18%) nitrogen, very 9.4 μg/gm) phosphorus, 90% 0.15 meq/100 gm) potassium, 43% 21.6 sulfur 50% 1.35 Zn. Nitrogen plays crucial role early growth where as inherently poor nitrogen phosphorus significantly Bangladesh. Moreover, imbalance restricted activities additional inorganic used fertilizers finally could adversely affect productivity.