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soil fertility

Catalogue: GRDC Factsheets
Soil type is useful in deducing the risk of micronutrient deficiencies... introduction A recent study undertaken by the International Crop demand and uptake Micronutrients are essential for healthy Plant Nutrition Institute (IPNI) on behalf of the Different crop species have different plant growth... Oats, wheat, barley (canola tolerant) SOurCe: rOB nOrTOn, iPni y e n t i w w e h t t a M : o t o h p Copper is a key element of chlorophyll and plays a central role in photosynthesis, and deficiencies are often associated with high organic matter soils...
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Catalogue: GRDC Updates
The development of delvers and the timing of delving, such as when the clay is near to the plastic stage, results in a much cheaper operation, the option to delve deeper and a dramatic increase in yield... The consistent increase in biomass above and below the ground was also very important, potentially resulting in increased organic matter in the soil... Farming north of Bordertown, SA on sandy soils has been a challenge and a great journey for Sue and myself since we started in our own right in 1979...
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Catalogue: GRDC Updates
Recent work in DAQ00148 and previous projects has focussed on developing new soil testing strategies (0-10cm and periodic 10-30cm testing to determine P and K status), soil tests (BSES P and tetraphenyl borate extractable K to measure slow release P and K reserves) and critical soil test values to trigger fertiliser application responses... Previous results (Spring 2011 Updates) showed that sorghum responses to P bands were improved when band spacing was 50cm or less, and similar trends have been obtained for K band spacings in the winter wheat crop at Brookstead (Table 2), although differences were not statistically significant... Similarly we are now undertaking more work on crop responses to S applications, especially when combined with P and/or K. Quantifying the costs and benefits of getting the right combination of nutrients in the right place at the right time will be essential to maintaining or improving profitability and sustainability of our cropping soils...
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Catalogue: GRDC Updates
Getting nutrition right in 2011 after a big year in 2010.. It is important that water soluble phosphorus is placed in the seed furrow or as close as possible to the seed furrow to allow access for developing root systems... The fertiliser concentrations in the seed zone are greatly influenced by the amount of soil disturbance, air velocity, ground speed, seeding depth, stubble cover, soil texture and moisture content during the seeding operation and its interaction with the concentration of fertiliser delivered to each seed-row...
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Catalogue: GRDC Factsheets
KEY poiNtS A range of soil test values used to determine if a nutrient is deficient or adequate is termed a critical range... recent research has highlighted that nitrogen applications can be wasted, even on cropping soils that have low n availability, if the levels of other nutrients such as potassium (K), phosphorus (P) and sulfur (S) are not adequate... The critical wheat soil S test value measured in the 0 to 30cm soil layer is 4.6 (4 to 5.3) mgS/kg for all soils to achieve 90 per_cent of maximum yield...
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Catalogue: GRDC Factsheets
KEY poiNtS A range of soil test values used to determine if a nutrient is deficient or adequate is termed a critical range... recent research has highlighted that nitrogen applications can be wasted, even on cropping soils that have low n availability, if the levels of other nutrients such as potassium (K), phosphorus (P) and sulfur (S) are not adequate... The critical wheat soil S test value measured in the 0 to 30cm soil layer is 4.6 (4 to 5.3) mgS/kg for all soils to achieve 90 per_cent of maximum yield...
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Catalogue: GRDC Updates
Managing subsoil constraints - crop and varietal tolerance, rotations, fallow management, crop responses schwenke2_2.. Results from a species and varieties trial on an unconstrained soil in northwest NSW in 2004 (Table 2) also showed species differences in soil water use, but no differences between the varieties chosen for the study even though there were some differences in observed rooting depth and grain yields... Table 4: Species and variety responses at a constrained site in northwest NSW. Variety differences within a species are shown by the letter after the result; those with the same letter following were not significantly different...
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Catalogue: GRDC Factsheets
KEy points After decades of consistent phosphorus (P) application, many soils in the western region now have adequate P status... The DGT measurement incorporates the initial soil solution P concentration, as well as the ability of the soil to resupply the soil solution pool in response to the removal of P. In this way, it is designed to mimic the action of plant roots so is a better method of predicting plant P requirements than methods based on chemical extractions, for example, Colwell-P... Soil tests conducted by Buntine grower Stuart McAlpine showed P at double the critical levels advised by CSIRO's Mike Wong...
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Catalogue: GRDC Factsheets
KEy points After decades of consistent phosphorus (P) application, many soils in the western region now have adequate P status... The DGT measurement incorporates the initial soil solution P concentration, as well as the ability of the soil to resupply the soil solution pool in response to the removal of P. In this way, it is designed to mimic the action of plant roots so is a better method of predicting plant P requirements than methods based on chemical extractions, for example, Colwell-P... Soil tests conducted by Buntine grower Stuart McAlpine showed P at double the critical levels advised by CSIRO's Mike Wong...
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Catalogue: GRDC Factsheets
KEy points After decades of consistent phosphorus (P) application, many soils in the western region now have adequate P status... The DGT measurement incorporates the initial soil solution P concentration, as well as the ability of the soil to resupply the soil solution pool in response to the removal of P. In this way, it is designed to mimic the action of plant roots so is a better method of predicting plant P requirements than methods based on chemical extractions, for example, Colwell-P... Soil tests conducted by Buntine grower Stuart McAlpine showed P at double the critical levels advised by CSIRO's Mike Wong...
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