Ground Cover North : Ground Cover 052 October-November 2004 - North
NEWS 19 OCTOBER 2004 TWICE THE CLEAN. TWICE THE MACHINE. R65/R75 285&330HP Gleaner is the finest combine harvester on the land and rightly so. Reliability, performance, capacity and a two year full warranty - they're all defining characteristics of the Gleaner machine. But it's the attention to detail and intuitive understanding of your needs which sets our combines apart. Take for instance the ingenious dual outlet cleaning system which efficiently and effectively strips chaff from the grain during the cleaning process. Why do we go to so much trouble to invent this level of technology? Because it delivers results. Now that's the bottom line. For the best part of a century, Gleaner has set the standard with a level of technological advancement and innovation that has changed the harvesting industry across the globe. From the world class operator cabin to the sheer mechanical simplicity, this is the combine for those who take their property and their livelihood seriously. For more information contact your local dealer today, or Freecall 1800 802 914 www.agco.com.au By EMMA LEONARD Retaining stubble is known to protect the soil and potentially improve yield. But for many growers it is still a headache at seeding, prompting the WA No- till Farming Association (WANTFA) to take a closer look at managing high-residue loads in a no-till system. WANTFA's Mike Collins says harvest is the first stubble management operation, and the study has found headers differ considerably in their ability to spread stubble. The degree of spread is also affected by cutting height and harvesting pattern. Three cutting heights have been tested according to different grower situations. In one trial, low was 20cm, medium 43cm and high 60cm. Low resulted in the most uneven spread, with up to 12 tonnes per hectare of standing and chopped stubble behind the header and as little as 2t/ha at the edge of the spread pattern. The highest cut gave the best spread, with between 5 to 6t/ha of loose and standing residue across the 11-metre spreader width. The medium height resulted in a similar spread pattern to the high cut, but still resulted in up to 9t/ha of stubble in the header row. In the experiment, spreading was consistently greater at the centre of the swath and sometimes to one side of centre. Mr Collins says that such a bias, resulting in an accumulation of material, comes from harvesting up- and-back. In the long term this would cause nutrients to build up in these areas. Starting alternate harvests half a header width in from the edge of the paddock would help reduce this annual concentration of stubble and, eventually, nutrients. Mr Collins has also looked at the impact of clumping and how this can be overcome. He has found: n lupins and canola seedlings are the most sensitive to clumping with emergence reduced by as much as 50 percent compared to a 10 percent reduction for cereal emergence at the same level of clumping; n sowing between last year's row results in less clumping. This means that those with auto-steer can virtually eliminate clumping; n in a long-term trial at Merredin on a sandy-clay loam (managed by Department of Agriculture engineer Glen Riethmuller), retaining stubble and using 36cm row spacing gave a wheat yield of 2.37t/ha compared to 1.99t/ha where stubble was burnt and 18cm spacing used. These figures are averaged from five wheat yields in 10 years of a wheat- pulse rotation; and n none of the residue management devices tested -- including stubble tubes, residue manager wheels, were able to deal well with stubble flattened bywheelsorstock--orbya roller for those managing snails. Some WA growers are experimenting with slashing stubble but these results are variable. It has been found that slashers work better on hot days (bringing a fire risk) because the residue is brittle and the material also spreads more evenly. However, slashers need to have the wheels at the back to reduce the amount that is rolled down. GRDC RESEARCH CODE WAN 00003, program 4 For more information: Mike Collins, 08 9622 3390, firstname.lastname@example.org Cut high for even stubble Ground Cover : have your say Are there areas of research and development you would like to see covered, or explored further, in Ground Cover? Perhaps you would like to suggest an idea for a particular article? You can contact Ground Cover's editors directly with ideas or comments that you feel will contribute to our coverage of the grains industry and its people. Published by the Grains Research and Development Corporation, Ground Cover is the premier publication for reporting on the progress of science and innovation in the grains sector. It is also the ideal forum for sharing ideas and experiences among all grains industry professionals. You can contact Ground Cover by email at email@example.com or fax: 03 9670 1127 Managing stubble: the highest cut gives the best spread.
Ground Cover 053 December-January 2005 - North
Ground Cover 051 August-September 2004 - North