Effects of Boron Application on Growth and Quality of Flue-cured Tobacco NC297 under Different Potassium Supply Levels

In order to provide reference for high quality tobacco producion,this experiment adopted a randomized block design in a field plot,and analyzed the effects of boron fertilizer on the growth,development on comprehensive quality of flue-cured tobacco by using mathematical statistics methods such as multiple comparison with NC297 as test material.The results showed that:spraying boron fertilizer on flue-cured tobacco leaves can promote the growth of flue-cured tobacco NC297 to a certain extent,effectively reduce the total particulate matter and tar content of tobacco,and play a positive role in regulating the total sugar,reducing sugar,nicotine and potassium content of flue-cured tobacco;the comprehensive quality of NC297 was the best when boron was applied at medium potassium level(K2B1).

河北省沿岸表层温盐特征分析

本文基于河北省沿岸4个海洋站的观测数据,综合统计分析该海域的表层海水温度和盐度,发现其具有地域性和季节性特征。表层水温存在年际变化和上升趋势,与气温显著相关,反映出其对海气相互作用的响应。表层盐度主要受黄河径流量的影响,秦皇岛站的表层盐度与黄河径流量存在明显的负相关性,表层盐度对黄河径流量的响应存在一年的滞后。