ABSTRACT

Twenty two soil samples (11 from 0-15cm and 11 from 15-30cm depths) were collected from IUBAT’s Rajendrapur Agricultural Research Station, Gazipur covering two depths and six sites representing               (I) vegetables, pulses and other crops, (II) wheat, rice and vegetable growing zone, (III) forest area, (IV) fruit growing zone, (V) maize cultivated area and (VI) lowland for boro cultivated area (Table 3-4). The soils were dried at IUBAT lab-2, ground, sieved and properly labeled. Twelve physical and chemical properties were studied at Humbold Soil Testing lab. BAU, Mymensingh. The morphological characteristics/description of the eleven representative soils is reported in Table 4. The soil properties studied covered textural classes (sand, silt and clay contents), particle density, pH, organic carbon, organic matter, N, P, K, S, EC, HCO3, Na and Ca contents. The soils were acidic (pH 5.49-6.01) light-red, brown, loamy types (loam, clay loam, silt loam, sandy loam etc.), organic carbon (0.637-1.950%), organic matter (1.102-3.374%), particle density (2.406 to 2.69gmcm-3, total N (0.072-0.187%), P (2.209-36.93ppm), K (0.104-0.209meq/100gm), S (10.14-43.00ppm), EC (33-164mS/cm), HCO3 (126-305ppm), Na (0.123-0.185meq/100g) and Ca (0.370-0.617meq/100gm). Minor variations of soil properties were recorded from soil to soil and surface (0-15cm) and sub-surface (15cm) depths where standard deviations (SD, minor values) confirmed the low variations of the results. As the soils are acidic with mostly forest vegetation where proper management system through various green manuring, and other manuring by various practices are essential for 2-5 years for developing sound land for growing of most agricultural crops for larger productions.

Key words: Soil fertility, physical and chemical properties of soils, nutrient contents, management.

Introduction

A universal concept “No soil no crop, no crop no food and no food no life” clearly and properly explain the importance of soil fertility. Soil, fertility is the capacity of soils to supply adequate/proper nutrients to crops. Practically, it is the inactive form of soil productivity i.e. a soil may be fertile but may or may not be productive. Through field and lab. analysis of soils under various conditions fertility can be confirmed. Polluted, hazardous and some problematic soils are not the fertile soils. Usually, all productive (growing of crops and vegetables) soils are the fertile soils but not all fertile soils are productive. Climate, rainfall, temperature, vegetation, drought, cyclone/tornato, erosion disasters etc. influences the soil fertility. Fertility is the originality of soils that rarely be changed naturally but through growing/improving of productive capacity-then fertility changes too. For studying of crop production works in the field usually basic studies of soil properties or soil fertility situation is important for all researchers where more than thousands of research works were done/completed with BAU soils by the MS and PhD students/researchers or different project works of the teachers in 1972-2023 where most of the these/reports are available at Univ. library. Sattar (CV) handled more than 100 soil fertility works for basic soil properties for supporting of main research and here 22 references (1-22) are listed dealing with fertility, productivity and other capacity and/or properties of soils. For proper crop growth, crop yield and food security soil fertility knowledge in important.