Soil macroporosity (voids with a diameter of 0)54 mm or more) was estimated in undisturbed soil columns obtained from eight 1 m by 1 m plots of a no-till "eld using image analysis, the soil samples having been scanned with a laboratory volume computer tomography (CT) scanner. Estimates of soil macro
A precision punch planter for use in tilled and untilled soils
โ Scribed by L.O. Adekoya; W.F. Buchele
- Publisher
- Elsevier Science
- Year
- 1987
- Tongue
- English
- Weight
- 423 KB
- Volume
- 37
- Category
- Article
- ISSN
- 0021-8634
No coin nor oath required. For personal study only.
โฆ Synopsis
A rolling punch planter with a cam-actuated opening mechanism was developed to plant maize (and other similarly sized grains) in tilled and untilled soils. Field tests showed that satisfactory planting of the seeds was achieved in an untilled field with up to 75~ residue cover (at about 5500 kg/ha). The within-the-row spacing of the punched holes and the depth of planting of the seeds were independent of the travel speed. The percentage of the punched holes containing a single seed decreased as the travel speed increased.
๐ SIMILAR VOLUMES
Batch equilibrium test results of Pb and Cd retention by kaolinite, humic acid and mackinawite and mixtures of these soil/ sediment materials are modeled using Freundlich isotherms with the retained metal plotted as a function of the equilibrium metal concentration, C e and as a function of the init