英语翻译If the reason for deficiency symptoms is low soil-test K

英语翻译
If the reason for deficiency symptoms is low soil-test K,the deficient areas can be targeted for after crop harvest soil sampling,testing,and appropriate fertilization.Deficient areas can be easily marked with hand-held global positioning receivers,and this information can be provided to a dealer having variable-rate fertilization capability.You should be aware that Iowa State University soil-test K interpretations recently were modified to recommend maintenance of 130 to 170 ppm for optimum crop production in most Iowa soils.For further information see ICM 10/20/2003 (Use new potassium soil test and fertilizer recommendations) and Iowa State University Extension publication PM 1688 (General Guide for Crop Nutrient and Limestone Recommendations in Iowa).Furthermore,these publications also explain that deep K placement for the next crop can go a long way toward alleviating deficiencies in ridge-till and no-till systems.A starter fertilizer treatment at planting also will help.If the deficiency symptoms are induced by factors other than low soil-test K,your area extension crop specialist or local crop consultant can provide suggestions about other soil or crop management practices that can alleviate future problems.
A large research project developed at farmers' fields and research farms continues studying these issues by evaluating K fertilization rates,soil-test methods,and interactions between fertilizer placement method and tillage system.A new study is investigating interactions between K fertilization and soybean diseases.Results will be shared as they become available.
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如果缺营养症的原因是土壤测试K值低,在收获作物后可以针对不足的地方土壤取样,测试,和适当的施肥.用手持式全球定位接收器很容易标明不足的地方,这些信息可以提供给有变量施肥能力的经销商.您应该知道,爱荷华州立大学土壤测试K表解释最近进行了修改,为提高作物产量,建议在绝大部分爱荷华州土壤里保持130至170 ppm浓度.进一步的信息参看ICM 10/20/2003（用新钾土壤测试和施肥建议）和爱荷华州立大学特刊 PM 1688（爱荷华州作物营养通用指南和和石灰石建议）.此外,这些出版物也解释了在垄作免耕系统中,未来作物的深K值分布向缓解趋势发展还有很长的路要走.种植时启动施肥处理也有帮助.
如果缺营养症不是因为土壤测试K值低而是因为其他因素引起的,您所处分区的作物专家或当地作物咨询专家可以为您提供其他可以缓解未来问题的有关土壤或作物管理的建议.一个大型研究项目研究了农民的农场,通过评估施钾率,土壤测试方法和施肥方法和耕作系统的相互作用来持续研究农场的这些问题.一项新的研究调查钾肥和大豆的疾病之间的相互作用.结果是可用的,可以共享.