You are here

soil fertility

Catalogue: GRDC Factsheets
a chemical analysis of recycled organics is essential in determining the potential nutrients available, calculating application rates and identifying potential benefits and risks... Soil contamination While recycled organics may improve soil health the potential build-up of some nutrients and heavy metals and other chemicals in the soil is an issue that needs to be considered and managed... Soil testing is essential to monitor changes in soil and adjust application rates ...
Related categories:
Catalogue: GRDC YouTube channel
Where soil P has accumulated above the soil test critical value it is possible to reduce P inputs without losing productivity... Soil testing for P can increase the profitability of fertiliser management decisions... Technology to reduce spray drift GCTV: Drift Reducing Technology..
Related categories:
Catalogue: GRDC Updates
We have used average prices for each crop: $200/t for sorghum, $250/t for wheat, $400/t for chickpeas and $700/t for mungbeans... At Gindie we produced an extra 600 kg/ha sorghum in 2011/12 and an extra 500 kg/ha chickpeas in 2013, which would return an extra $320/ha for the first 2 crops after application using average crop values... At Wondalli we produced an extra 500 kg/ha sorghum in 2008/09 followed by an extra 650 kg/ha wheat in 2011, which would return an extra $263/ha for the first 2 crops after application using average crop values...
Related categories:
Catalogue: GRDC Updates
CSIRO, Curtin University and DAFWA have jointly developed an economic calculator to help consultants and farmers decide which paddocks may warrant investment in VRT or PA... On one farm in Bodallin, 9 paddocks out of 20 generated returns of more than $15/ha or more when managed with VRT... To explore the issue we have developed a PA economic calculator for the industry to address questions about the likely return that VRT can deliver to an individual field...
Related categories:
Catalogue: GRDC Updates
The structure of roots is a consequence of their primary functions- growing through an abrasive medium (the soil), acting as plumbing to absorb and transport water to the shoot, and actively and selectively absorbing essential nutrients such as mineral N (nitrate and ammonium), inorganic P and K. the structure of leaves is designed to absorb radiation for photosynthesis, regulate evaporative losses of water, act as a sink for nutrients and water transported from the root system, and produce carbohydrates from photosynthesis... The root surface comprises a layer of epidermal ('skin') cells (some with extensions or 'root hairs') that absorb water through their cell walls and cell membranes and which have specific sites where nutrient forms such as nitrate, ammonium, phosphate and potassium are bound onto 'carrier' molecules and transported across the cell membrane into the interior of the cell... Any so-called microbial activators or mineral-solubilising microorganisms are operating in a hostile environment full of competitors...
Related categories:
Catalogue: GRDC Updates
Soil salinity refers to a high concentration of salts in the landscape, mainly common salt or sodium chloride (NaCl), which has a negative impact on soil and water quality... A related protein in the test plant Arabidopsis, AtNHX1, has a very well-characterised role in salt tolerance... A deeper understanding of the mechanisms underlying this salt tolerance will be critical to the use of NHX proteins in producing transgenic salt-tolerant crop species...
Related categories:
Catalogue: Ground Cover
A Western Australian study shows that applying biochar made from wheat chaff and eucalyptus wood may have some negative effects on sandy soils.. To assess the impact of biochar on nitrogen leaching in a sandy soil from Meckering, WA, Mr Dempster ran another glasshouse trial and compared the results to those achieved by adding clay - another ameliorant being used by some growers to enhance soil fertility... The results showed yield decreased significantly from 2.1t/ha to 1.7t/ha when biochar was banded into the subsoil...
Related categories:
Catalogue: Ground Cover
Protein lost in long wet season - By Rachel Bowman.. Maurie Conway, from the Queensland Department of Employment, Economic Development and Innovation, says the following influences are likely to be contributing to the problem: low starting soil nitrogen due to low organic carbon (less mineralised nitrogen) and denitrification; wheat roots were unable to easily access applied nitrogen because it tended to remain close to the soil surface; soil erosion; and leaching... Mr Conway says nitrogen was mostly depleted by crops, soil erosion and denitrification, whereas losses resulting from leaching were generally low...
Related categories:
Catalogue: GRDC Publications
Soil organic matter contributes to a range of biological, chemical and physical properties of soil and is essential for soil health... Soils rarely reach their theoretical potential for organic matter storage (see Figure 1.7)... In soils with low clay content the amount of humus and resistant soil organic matter is increasingly important to nutrient exchange because its large surface area gathers (adsorbs) cations from the soil solution, holding nutrients that would otherwise leach...
Related categories:
Catalogue: GRDC Publications
Overall, soil CEC and SOC content was greatest in the 0.2 and 0.2-2 m fraction, indicating that size, and probably type, of SOM influenced CEC... Kaiser et al. (2003) found that soils with a high content of black carbon showed increased sorption ability compared with plant- and microbial-derived SOM... Addition of organic amendments can increase P availability to plants by decreasing the P adsorption capacity of soils...
Related categories:

Pages