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采用室内培养试验和田间试验相结合的方法,研究土壤酸度对石灰施用量的动态响应规律,以及石灰施用量对烤烟农艺性状及经济性状的影响。结果表明:酸化黄壤在室内培养环境下对石灰的响应可分为3个阶段,即快速变化阶段,土壤pH值急剧升高,持续时间较短;缓慢变化阶段,土壤pH值的变化速度以及持续时间受石灰施用量的影响,石灰施用量低于3.00 t/hm2时该阶段持续时间约60 d,石灰施用量高于4.50 t/hm2时该阶段持续时间为15~30 d;稳定阶段,石灰施用量与土壤pH值间呈显著的非线性正相关关系。田间试验研究表明,土壤pH值随石灰施用量的变化规律基本与室内试验研究结果相吻合。综合石灰施用量对烤烟影响发现,在pH值为5.0左右的酸性黄壤整治烟田中,推荐提前移栽期60 d向烟田垄体中施入1.50 t/hm2的石灰以矫正土壤酸度,促进烤烟生产。
The effects of soil acidity on the dynamic response of lime application and the effects of lime application on the agronomic and economic characteristics of flue-cured tobacco were studied by a combination of indoor cultivation and field experiments. The results showed that the response of acid yellow soil to lime could be divided into three stages, that is, the rapidly changing stage, the soil pH value increased sharply and the duration was short. In the slowly changing stage, the change speed of soil pH value and the continuous Time is affected by the amount of lime applied, the duration of this stage is about 60 d when the lime application rate is less than 3.00 t / hm2, and the duration is 15~30 d when the lime application rate is higher than 4.50 t / hm2. In the stabilization stage, There was a significant nonlinear positive correlation between application rates and soil pH. Field experiments showed that the variation law of soil pH value with the lime application rate basically accorded with the laboratory test results. Comprehensive lime application rate on flue-cured tobacco found that in the pH value of about 5.0 acidic yellow soil remediation tobacco fields, we recommend 60 days ahead of schedule to tobacco ridge ridge body applied 1.50 t / hm2 of lime to correct soil acidity and promote tobacco production .