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A New Seed Pressing System for Ryegrass Suppression and Healthy Lupin Establishment

Published by the American Society of Agricultural and Biological Engineers, St. Joseph, Michigan

Citation:  Paper number  011040,  2001 ASAE Annual Meeting. (doi: 10.13031/2013.3429) @2001
Authors:   Mohammad Amjad, Glen Riethmuller
Keywords:   Lupins, weed control, rotary, harrows, press wheels, seed drill, Australia, farming systems, seedling emergence, water harvesting, stubble, sowing

The development of herbicide resistance in annual ryegrass (Lolium rigidum) now has added a major new challenge for lupin producers in Western Australia. A new sowing technique was developed, tested and demonstrated in comparison with the conventional methods of sowing lupins using press wheels or harrows. The lupin seed was pressed into the soil but the soil was left loose above the seed using a depth controlled rotary harrow as compared to firming seed and soil together by press wheels. This new system gave excellent results in terms of establishment, annual ryegrass seed set reduction and yield in a range of soil-moisture environments in Western Australia. During 1997 and 1998, lupin yield improvement up to 16% (average 5.4%) with 42% annual ryegrass seed set reduction was observed in field experiments. Machinery manufacturers now have the challenge to achieve this principle on commercial broadacre seed drills.

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