Efficient farming can be practiced in many ways, but one method that has become more popular in recent years is the use of cover crops. The quality of the soil has a direct impact on the health of the farm and its output, so crops that boost soil quality rather than degrading it actually add to the value of the land they are grown on. There are various kinds of cover crops which have different ecological impacts on the land, but the general idea is that rain water is held in the soil by the plants, and nitrogen from lower soil layers is drawn higher up in the soil. This way, the next crop, such as corn, can make better use of nutrients. Peas and soybeans have traditionally been used for cover crop purposes, but Minnesota farmer Dean Schuette took part in a trial using tillage radish as a cover crop in November 2011. The goal is to see if this increases the corn yield in 2012, but early results from the mix of radish and an oat-pea mix have already yielded radishes that are larger than normal.
Researchers say that deep-rooted cover crops work best in drawing up the nitrogen, as do mustard crops. The effectiveness of using a cover crop is dependent on the species of crop; different plants grow roots at different speeds and which extend to different depths. Planting dates matter too, because most plant roots will grow longer over time. This is crucial in selecting the type of plant depending on the type of winter expected for a certain region. Even if plants die the nitrogen can still be left at higher level in the soil for the next crop. Oats and oilseed radish usually leak their nitrogen storage quicker than other plants so that it is there when the next crop is established. With other cover crops, such as rye, the timing of nitrogen release can be unpredictable.
In Iowa, a trial using rye cover crops has been taking place for the last couple of years. Farmer Arliss Nielson planted hairy vetch and sweet clover, both along with winter rye, over 350 acres. The rye was seeded into the corn crop by airplane in September 2010, and the corn stalks the following season seemed to be more protected, even though the vetch and clover didn’t survive the winter. Nielson plans to continue participation in the project, while other farmers have considered being involved as part of a cost-sharing program called the Boone River Watershed Mississippi River Basin Initiative.
Cold temperatures eventually kill many cover crops. Radish, for example, often dies off in late fall, but rye can capture some of the nitrogen released by the plant matter. Combinations of cover crops, therefore, have been seen as beneficial. Other projects, such as one in Ontario, Canada, used cover crops and manure following a wheat harvest in 2003. Cover crops were planted after an early harvest of a vegetable crop; both studies are just a couple of examples of how farmers have looked at cover crops and continue to do so. The effectiveness of various methods is still being studied to find the most effective ways to protect main crops as well as make them more lucrative.
Sources:
AgriNews (http://www.agrinews.com/cover/crop/trial/tries/tillage/radish/story-4047.html)
AgriNews (http://www.agrinews.com/farmers/are/giving/cover/crops/a/try/story-3472.html)
Eastern Ontario AgriNews (http://www.agrinewsinteractive.com/archives/article-5504.htm)

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