R语言：不使用管道函数计算平均气温、总降雨量和生长积温
avg_temperature <- mean(df$MaxT[df$DaysAftersowing >= day1[[1]] & df$DaysAftersowing <= day2[[1]]], na.rm = TRUE)
total_rainfall <- sum(df$Rain[df$simulation_days >= day1[[1]] & df$simulation_days <= day2[[1]]], na.rm = TRUE)
gdd <- sum((df$MaxT[df$DaysAftersowing >= day1[[1]] & df$DaysAftersowing <= day2[[1]]] + df$MinT[df$DaysAftersowing >= day1[[1]] & df$DaysAftersowing <= day2[[1]]])/2, na.rm = TRUE)
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