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compacted soil

Catalogue: GRDC Final Reports
Large-scale field experiments on sandy and clay soils at Merredin, Nungarin, Tammin, Kellerberin and Corrigin shires (Western Australia) were conducted by Dr M A Hamza (in collaboration with growers) to find the optimum combination(s) of ripping depth and tine spacing for maximum yield... The major finding was that the depth of ripping could be reduced to 30cm provided that tine spacing was no wider than 30cm... A supplementary outcome was addressed, facilitated by acquisition of a shallow leading tine (SLT) ripper donated by AGROWPLOW and an air-seeder bin funded by GRDC...
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Catalogue: GRDC Updates (North)
Based on this, we estimate that water used by weeds in the wet weedy (+I+W) treatment up to the midfallow period was 593 x 1688 (biomass) / 10 000 = 100 mm; for the dry weedy (-I+W) treatment water use is estimated at 30 mm... The results showed that Zn uptake by plants and in the grain could be most improved by mixing Zn with N and P (as technical grade MAP and ammonium nitrate dissolved in water) in a single solution and injecting it into the soil to a depth of 40 cm... Results from our laboratory experiments have confirmed that fluid forms of P have very different physical and/or chemical effects on soil in the fertilizer band in calcareous soils, and improve plant P uptake...
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Catalogue: GRDC Updates (South)
Based on this, we estimate that water used by weeds in the wet weedy (+I+W) treatment up to the midfallow period was 593 x 1688 (biomass) / 10 000 = 100 mm; for the dry weedy (-I+W) treatment water use is estimated at 30 mm... The results showed that Zn uptake by plants and in the grain could be most improved by mixing Zn with N and P (as technical grade MAP and ammonium nitrate dissolved in water) in a single solution and injecting it into the soil to a depth of 40 cm... Results from our laboratory experiments have confirmed that fluid forms of P have very different physical and/or chemical effects on soil in the fertilizer band in calcareous soils, and improve plant P uptake...
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Catalogue: GRDC Factsheets
Deep ripping not appropriate for all soil types A comprehensive understanding of the cause and location of high soil strength is required before undertaking deep ripping as research has shown it is does not provide an economic solution in some soil types... KEY POINTS Deep ripping of compacted soils is most likely to improve grain yields on sandy soils and where compaction has occurred on upper parts of the soil profile through machinery traffic or livestock trampling... Overall, compacted subsoils impede root growth, causing reduced plant vigour and poorer water-use efficiency as roots have limited access to water and nutrients, especially in the subsoil...
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Catalogue: GRDC Final Reports
Improving compacted soils in the eastern wheatbelt.. The pore spaces between soil aggregates are enlarged and can hold and conduct more water increasing the ability of the soil to store and supply water... A combination of deeper ripping and closer tine spacing can give larger yield increases...
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Catalogue: GRDC Updates
Without applied fertiliser, crop 1 (sorghum) showed no response to the tillage treatments; crops 2 and 3 had lower yields in AT than SM, RT or NT; crops 4-10 had no responses; and 7 of the final 12 crops had lower yields in AT than SM, RT or NT... Results on the same soil type have shown that compaction can persist for 5 years after trafficking has ceased... Tillage had reduced the soil organic carbon content at 0-10 and 10-20 cm after 20 years of treatment application (Figure 5)...
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Catalogue: GRDC Updates (West)
Classic ripper uses one main tine to rip the soil to the required depth... Treatment SLT D (two SLT tines18 and 23 cm deep in front of a 33 cm main tine) also showed a decrease in draft force relative to the classic treatment but the decrease was not statistically significant and below those of treatments SLT A and SLT B. Both the treatments SLT C (one 18 cm SLT in front of a 33 cm main tine) and the SLT Offset treatments showed an increase in draft force relative to the classic treatment... The other two SLT treatments, SLT C and SLT D showed an increase in specific draft force of 5.33 kN/m2 or 5.62% and 7.36 kN/m2 or 7.76% respectively...
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Catalogue: GRDC Factsheets
Deep ripping not appropriate for all soil types A comprehensive understanding of the cause and location of high soil strength is required before undertaking deep ripping as research has shown it is does not provide an economic solution in some soil types... KEY POINTS Deep ripping of compacted soils is most likely to improve grain yields on sandy soils and where compaction has occurred on upper parts of the soil profile through machinery traffic or livestock trampling... Overall, compacted subsoils impede root growth, causing reduced plant vigour and poorer water-use efficiency as roots have limited access to water and nutrients, especially in the subsoil...
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