สถิติการเกษตรของประเทศไทย = Agricultural statistics of Thailand

Torque and energy characteristics for strip-tillage cultivation when cutting furrows using three designs of rotary blade

Triaxial Testing of Unsaturated Agricultural Soils

Furrow parameters in rotary strip-tillage: Effect of blade geometry and rotary speed

Force and pressure distribution under vibratory tillage tool

This research study was done in the soil dynamics laboratory of Faculty of Agricultural Engineering, Kasetsart University, Kamphaengsaen Campus, Thailand, to understand the benefits of driven tillage disc by an external power compared to the conventional free rolling tillage disc under controlled experimental conditions. Performance of free rolling and power operated standard concave tillage disc was evaluated in the soil bin with a sandy loam soil (USDA classification). The setup consisted of soil bin system and measurement system. Double extended octagonal ring (DEOR) transducer and torque transducer with slip ring were used for forces and torque measurements. Different disc angles and disc speeds were considered for the study. Soil failure patterns of both discs were also studied. Driving disc by an external power found to be significantly affecting performance of tillage disc. Draft force of the disc observed at disc angles of 23 o , 28 o and 33 o was reduced from 620 N, 860 N and 947 N to 188 N, 254 N and 360 N respectively when free rolling disc was replaced by powered disc. However it increased torque acting on disc driving shaft. Similar trend can be observed in other kinds of soils, however trend will be positioned up or down on Y-axis depending on respective soil strength properties. Moreover, powered disc provided continuous and smooth flow of furrow slice to the side. Consequently, powered disc was proved advantageous over free rolling disc in terms of smooth soil displacement, easy soil volume handling, better inversion of the furrow slice and reduced soil reactions. Moreover it provided better energy utilization.

Performance of Free Rolling and Powered Tillage Discs

Soil disturbance and force mechanics of vibrating tillage tool

Performance of an oscillating subsoiler in breaking a hardpan

Problem statement: Sugarcane is one of the main economic crops in Thailand. After planting, it can be harvested annually for several successive ratoon crops. Recently, soil compaction due to mechanization has been recognized as a serious problem in sugarcane production. Therefore, this study aimed to clarify the effects of soil compaction on the growth and yield of sugarcane. Approach: The field experiments were conducted in loamy soil using a Randomized Complete Block Design (RCBD) with four treatments of soil compaction prepared by 0, 5, 15 and 20 numbers of wheel passages of a tractor. Results: The results showed that soil compaction had significant effects on both the growth and yield of sugarcane, with the exceptions of tillering and Brix. The greatest reduction in yield compared with the control field was 22.9%, which resulted from compacting with 15 tractor passages. The influence of block or furrow irrigation was indicated by the positive effect that higher watering had on minimizing the impact of soil compaction on the growth of sugarcane. Conclusion: Effects of soil compaction on growth and yield of sugarcane were clarified to some extent.

Tanya Niyamapa

Papers

Performance of Free Rolling and Powered Tillage Discs

Force and pressure distribution under vibratory tillage tool

Soil disturbance and force mechanics of vibrating tillage tool

Performance of an oscillating subsoiler in breaking a hardpan

Effects of Machine-Induced Soil Compaction on Growth and Yield of Sugarcane