Sweet potato (Ipomoea batatas) manufacturing within the northern United States is restricted because of the perceived boundaries of a brief rising season and comparatively cool summer time temperatures, but latest research have proven yield in northern areas could be better than the nationwide common when candy potatoes are grown with plastic mulch. A research, now revealed in HortTechnology, was performed in northwest Washington to judge the productiveness of “Covington” candy potato with polyethylene (PE) and soil-biodegradable (BDM) mulches and totally different in-row spacings (20, 30, and 38 cm) in 2019.
The goal of a 2019 experiment was to determine whether or not candy potatoes could possibly be efficiently grown in northwest Washington. Specific targets have been to 1) examine the impacts of PE mulch and BDM and totally different in-row spacings on productiveness in northwest Washington, and a couple of) determine potential pest threats of candy potato manufacturing on this area and consider resistant accessions to handle the pest drawback. Although lots of the candy potato slips arrived for the experiment unwell because of journey points, there have been sufficient slips for researchers to efficiently conclude that wireworm proved to be the one pest that severely affected candy potato manufacturing, damaging 98% of storage roots.
The goal of a 2020 experiment was then to judge wireworm-resistant accessions. Eight wireworm-resistant candy potato accessions have been acquired from the USDA, Agricultural Research Service. Plant materials arrived as tissue tradition plantlets and on arrival have been washed and transplanted into sterilized 4-inch pots crammed with autoclaved potting combine (the identical product as in 2019) that was frivolously moistened and positioned right into a humidity field. Two accessions didn’t survive, and the remaining six accessions have been propagated by vine cuttings within the greenhouse. The six accessions have been transplanted in the identical subject the place candy potatoes have been grown in 2019. On common, solely 16% of the crop was broken by wireworm.
Both PE and BDM mulch elevated soil temperature and led crops to develop into established and develop extra rapidly. Mulch kind didn’t considerably have an effect on whole yield, however the yield was greater with PE and there have been seven instances extra jumbo candy potatoes with PE mulch. One drawback of PE mulch is that it have to be eliminated prior to reap, whereas BDM mulch doesn’t should be eliminated or disposed of on the finish of the season.
The research demonstrates there may be potential to develop candy potatoes efficiently in northwest Washington for native contemporary and processing markets. However, there are a number of limitations to manufacturing that have to be addressed: sourcing a regional, dependable provide of wholesome candy potato slips; creating strategies to scale back wireworm injury; together with genetic resistance; and the power to extend subject soil temperature.
Sweet potato microbiome analysis necessary first step in the direction of bettering yield
Srijana Shrestha et al, Plastic Mulch and In-row Spacing Effects on Sweetpotato Yield in Northwest Washington, HortTechnology (2022). DOI: 10.21273/HORTTECH04992-21
Steps for efficiently rising candy potatoes in Washington (2022, September 22)
retrieved 22 September 2022
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