Effects of controlled traffic in corn plots

Sial, Jehangir Khan

doi:10.31274/rtd-180813-10592

Cited by 2 publications

(5 citation statements)

References 35 publications

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“…Depth shows significantly different values for the penetration resistance even before the tillage treatment was applied (Table 16 through 18). This is in agreement with previous investigations (Blake et al, 1976;Dechnik et al, 1982;McKyes et al, 1979;Negi et al, 1981;Soane et al, 1982;and Sial, 1987). Ail treatments (average across depths) had a highly significant effect on penetration resistance (Table 15) abcdevaiues of levels of each factor followed by different letters are statistically different at ^90 percent probability level.…”

Section: Mean Comparison Of Bulk Density Among the Treatments Forsupporting

confidence: 93%

Tillage-induced changes in the physical properties of soil

Rizvi

Marley²,

Colvin³

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Mean penetration resistance before tillage and depth at Faisalabad Mean penetration resistance after tillage and depth at Faisalabad Mean penetration resistance before tillage and depth at Pirsabaq Mean penetration resistance after tillage and depth at Pirsabaq Mean surface roughness coefficient for before and after tillage treatments Mean emergence count as affected by tillage at Islamabad Mean emergence count as affected by tillage at Faisalabad Mean emergence count as affected by tillage at Pirsabaq 1 I. INTRODUCTION Tillage has been a dominant activity in agriculture from the beginning of civilization. Principal reasons for tillage were to establish and maintain a crop free of weeds (Cannell, 1985), bury plant materials (Sprague, 1986), mix lower horizons with surface layers (Sprague, 1986), loosen the surface for water movement (Unger and Fulton, 1990), aid seed placement, encourage emergence (McCalla, 1967), and reduce weeds, insects and diseases. Changes in tillage procedures, practices, tools, and in tillage terminologies have also occurred with the passage of time. These changes were basically crop-oriented, soil-oriented and labor-oriented. Tillage tools have evolved from rudimentary ones operated by humans to more sophisticated ones powered by animals and, eventually, by machines (Schafer and Johnson, 1982). When shifting from moldboard plow to a disk, from a cultivator to a rotary tiller, or from extensive tillage to limited tillage, we change the seed environment that is created. In other words, a change in tillage will cause a change in resulting physical properties (Cassel, 1982). These properties include bulk density, soil moisture, and nutrient availability. Tillage operations, regardless of the tillage implement, alter soil physical properties. The soil may be 2 loosened, granulated, compacted, crushed, inverted, sheared, or shattered (Cassel, 1982). In short any manipulation that changes soil condition may be considered tillage, but there is limited information available concerning tillage-induced soil changes (Gantzer and Blake, 1978; Erbach et al., 1986). To understand tillage effects on a given soil physical property, one must also consider the effects on related physical properties (Hill, 1990). Ehlers (1984) reviewed tillage research and mentioned that little effort has been spent trying to understand how the soil physical factors actually influence plant growth and yield. The same is true for the transmission of external forces within the soil and the effect of these forces on the arrangement of soil particles and pore spaces (Ehlers, 1982). Economic considerations and physical limitations force us to consider, how deep and how much to till. Excess tillage overpulverizes the soil and accelerates the loss of soil moisture and organic matter (Sprague, 1986). Less tillage may reduce yield by not providing the required seed environment (Griffith et al., 1986). Progress in tillage research has been greatly hindered by the presence of the many soil and weather variables which affect tillage res...

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Section: Mean Comparison Of Bulk Density Among the Treatments Forsupporting

confidence: 93%

Tillage-induced changes in the physical properties of soil

Rizvi

Marley²,

Colvin³

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“…Table 6 shows that no-till plots^lad slightly higher moisture contents than the chiseled plots. Similar results were obtained by Sial et al (1986) and Sial (1987) in these plots. Kanwar (1986); Johnson and Grisso (1984); and 3Levin et al (1977) also reported higher moisture contents in the no-till plots.…”

Section: Moisture Cotitentsupporting

confidence: 93%

“…The main effect of depth on penetrometer resistance was highly significant in set two, and showed an increasing trend with depth (Table D.4). This is in agreement with Sial (1987); McKyes et al (1977); Negi et al (1981) and Soane et al (1982).…”

Section: Penetration Resistancesupporting

confidence: 90%

“…Sets one and three had lower mean penetration resistance values for the no-till plots than were observed in set two. Higher values of mean penetration resistance in no-till plotes for set two were in agreement with the findings of Sial (1987), Dickey et al (1982), Radcliffe and Hargrove (1985);and Negl et al (1981). Set one and set three did not show the same trend, probably because the tillage effect diminishes with time.…”

Section: Penetration Resistancesupporting

confidence: 88%

“…This experiment was conducted on established plots where controlled traffic studies in corn plots were carried out in the years (Sial, 1987. The plots were in continuous corn.…”

Section: Procedures Descriptionmentioning

confidence: 99%

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Effects of controlled traffic in corn plots

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