Topic
Disc harrow
About: Disc harrow is a research topic. Over the lifetime, 242 publications have been published within this topic receiving 2069 citations. The topic is also known as: disk harrow.
Papers published on a yearly basis
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Papers
TL;DR: In this paper, the authors measured the specific and energy consumption of different tillage implements and soil conditions during primary tillage at three different water contents (Wet, Moist and Dry) on two sites.
Abstract: The objective of the present study was to measure the specific draught (force per cross-sectional area of worked soil) and energy use for soil fragmentation for different tillage implements and soil conditions. Draught was calculated from measurements of fuel consumption and speed during tillage with a mouldboard plough and a chisel plough set to working depths of 13, 17 and 21 cm, and a disc harrow. Tillage was carried out at three different water contents (“Wet”, “Moist” and “Dry”) on two sites. The average working depth was calculated from weighing the loose soil within a 0.25-m 2 frame. Specific area of the soil was determined by sieving. Soil strength was measured in situ using a shear vane and a penetrometer. Average working depth was much less than the set working depth for the chisel plough. Specific draught was generally the lowest for the mouldboard plough and the highest for the chisel plough, and increased with decreasing soil water content. The specific draught was strongly correlated to soil cohesion, but not to penetration resistance. The proportion of coarse aggregates after tillage was the highest for the mouldboard plough and the lowest for the moist soil. The energy use for soil fragmentation was in most cases the lowest for the disc harrow, while there were small differences between the chisel and the mouldboard ploughs. The results show that the mouldboard plough is energy efficient for loosening soil, while the disc harrow is energy efficient for soil fragmentation during primary tillage. Tillage at an intermediate water content, close to the plastic limit, gave the largest proportion of small aggregates and consequently the lowest energy use for soil fragmentation.
128 citations
TL;DR: In this paper, the authors evaluated the effects of different tillage systems on chemical and physical attributes of a soil, in a long-term experiment installed in 1985, in which samples were collected after the culture of maize (crop 2001/02), at depths of 0-5, 5-10 and 10-20 cm.
Abstract: Different tillage systems cause changes in the chemical, physical and biological attributes of a soil, requiring modifications in the requirements of fertilization and liming. The aim of this work was to evaluate the effects of tillage systems on chemical and physical attributes of a soil, in a long-term experiment installed in 1985. Since then, the soil has been cultivated with annual cultures and submitted to six tillage systems: no-tillage (SD), disc plow (AD), moldboard plow (AA), heavy disc harrow (GP), heavy disc harrow + moldboard plow (GP + AA) and heavy disc harrow + disc plow (GP + AD). The experimental design was in completely randomized blocks with four replications. Samplings were collected after the culture of maize (crop 2001/02), at depths of 0-5, 5-10 and 10-20 cm. Soil samples were submitted to chemical and physical analyses and the averages compared by the Tukey test. The tillage systems affected the chemical and physical attributes of a soil distinctly. Greatest differences were observed between the SD treatment and the others. SD showed higher bulk density values than the other treatments, in the average of the three depths. In the 0-5 cm layer of SD, increments of the medium values of organic matter, pH, cation-exchange capacity, exchangeable calcium, exchangeable magnesium, exchangeable potassium and phosphorus available were observed; in relation to the other depths. The aluminum value was smaller in the SD treatment in the 0-5 cm layer than the others; at the depth 10-20 cm, this value was higher than the treatments AD, GP and GP + AA. Treatments AD, GP, GP + AD and GP + AA showed higher values of exchangeable potassium than the treatments SD and AA, at the depth 0-5 cm. Treatment SD presented values of available phosphorus superior to the other treatments, at the depth 0-5 cm and in the average of the three depths.
124 citations
TL;DR: In this paper, the performance of the Century simulation model in an acid tropical soil under different tillage systems including no-tillage (NT) and different plowed systems using Century model was evaluated.
100 citations
TL;DR: In this paper, an investigation was carried out to predict the draught requirements of commonly used tillage implements in any field condition from the knowledge of: (i) the requirements of reference tillage tools in a reference soil condition; and (ii) the scale factors related to soil properties and implement geometry.
85 citations
TL;DR: In this paper, the authors evaluated the agronomical characteristics and yield of corn grown after green manures under no-tillage and conventional tillage (one disc harrow and two levelling harrow) systems.
Abstract: The succession of grain crops after green manures can improve physical, chemical and biological soil conditions, with increases on grain yield. The objective of the study was to evaluate the agronomical characteristics and the yield of corn grown after green manures under no-tillage and conventional tillage (one disc harrow and two levelling harrow) systems. The experiment was carried out in a Typic Haplustox, covered by savanna vegetation, in Selviria, MS, Brazil. The experimental design used was randomized blocks, in a split plot scheme, with four replications. Four green manures were used: black velvet bean, pigeon pea, sunn hemp and millet and fallow area (spontaneous vegetation). The sunn hemp previously grown in spring increased 18.5% the corn yield, compared to the fallow, on a year without dry periods, in both no-tillage and conventional tillage systems. The conventional tillage provided the largest grain yield in years with dry periods.
71 citations
Related Topics (5)
Performance Metrics
| Year | Papers |
|---|---|
| 2021 | 3 |
| 2020 | 11 |
| 2019 | 12 |
| 2018 | 15 |
| 2017 | 10 |
| 2016 | 10 |