![]() Narrow rows also offer the benefits of increasing early-season light capture, suppressing weed control and reducing erosion. Soybeans planted in narrow rows will canopy over more quickly than in wide rows, which is important when the length of the growing season is shortened. Narrow row spacing (15-inch or less) has often resulted in a yield advantage compared to 30-inch rows in late plantings. Still, seeding rate can be slightly increased if soybeans are planting too late, in order to increase canopy development. Recommended seeding rates for double crop soybeans are no different than for soybeans planted at a typical planting date in a given area or cropping system. Do not apply N in the furrow with soybean seed as severe stand loss can occur. If that’s not possible, banding it on the soil surface would be acceptable. A soil test before wheat harvest for N levels is recommended. The earlier you can plant, the higher the yield potential of the crop if moisture is not a limiting factor.Īdding some nitrogen (N) to double crop soybeans may be beneficial if the previous wheat yield was high and depleted soil N. The goal is to maximize the length of the growing season of the crop, so prompt planting after wheat harvest time is critical. Planting a variety that is too much later in maturity, however, increases the risk that the beans may not mature before frost, especially if long periods of drought slow growth. Planting a variety with the same or perhaps even slightly later maturity rating (compared to soybeans planted at a typical planting date) will allow the plant to develop a larger canopy before flowering. Soybeans flower in response to a combination of temperature and daylength, so shifting to an earlier-maturing variety when planting late in a double crop situation will result in very short plants with pods that are close to the ground. Variety selection for double cropping is important. Later in the summer, a healthy soybean canopy may suppress weeds enough that a late-summer burndown application may be avoided. Still, it is highly recommended to apply a pre-emergence residual herbicide before soybeans are planted especially if weed resistance to glyphosate has been a problem. In fact, having beans on the field may even reduce herbicide costs compared to leaving the field fallow. The cost for weed control can’t really be counted against the soybeans, however, since that cost should occur whether or not a soybean crop is present. However, with the development of glyphosate-resistant weeds, additional herbicides may be required to achieve acceptable control and minimize the risk of further development of resistant weeds. With glyphosate-resistant varieties, often the only production cost for planting double crop soybeans in recent years has been the seed, an application of glyphosate, and the fuel and equipment costs associated with planting and harvesting. Soybeans are probably the most commonly used crop for double cropping, especially in central and eastern Kansas. Management considerations, production costs, and yield expectations for several double crop options are discussed below. Most of the brassica, or mustard type, crops are likely to be very susceptible to residues of the sulfonylurea herbicides. Generally, there are statements on most labels that indicate “no other crops” should be planted for a specified amount of time, or that a bioassay must be conducted prior to planting the crop. If a crop isn’t listed on the label, that doesn’t mean there are no restrictions. ![]() There is little or no mention of rotational restrictions for specific cover crops on the labels of most herbicides. Cover crops can be challenging in this regard. One major consideration before deciding to plant a double crop or cover crop after wheat is the potential for herbicide carryover. Cover crops are also an option for planting after wheat. Other possibilities include summer annual forages and specialized crops such as proso millet or other short-season summer crops – even corn. The most common double crop options are soybean, sorghum, and sunflower. The soil moisture status is not as desirable as in previous years, thus the odds of success this season may be impacted by the low soil moisture and early-season heat conditions. Heat and/or dry conditions in July and August may cause problems with germination, emergence, seed set, or grain fill. The available growing season is relatively short. Issue 697 June 8th, 2018 Next Double crop options after wheatĭouble cropping after wheat harvest can be a high-risk venture.
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