The experimental research on establishment of the soil water retention curves (pf) in order to determine suitable irrigation schedule for dry crops at the droughty region of the South Central Vietnam

Abstract

     The correlation result of the experimental research on establisment of the soil water retention curves (pF) at the droughty region of the South Central Vietnam has been closely (R2 from 0,96÷0,99). The calculated results of soil water capacity show that the rate of total available soil water compared with field capacity is fairly high, from 56,91% (layer 0÷10cm) to 64,64% (layer 0÷60cm); Readily available soil water (RAW) of some dry crops are as follows: with active roots from 0÷40cm, RAW of vine is the smallest, the next are in turn dragon and sugar-cane, RAW of jujubetree with active roots from 0÷60cm is medium, RAW of onion, garlic and vegetables with active roots from 0÷20 or 30cm are fairly small. These calculated and experimental results are very important in order to apply in determining soil moisture process for establishment of suitable irrigation schedule for popular dry crops at the droughty region of the South Central Vietnam.