Peranan Mulsa Dan Pembenah Tanah Pada Dinamika Dan Pengawetan Lengas Tanah

Authors

  • AZ. Purwono Budi Santosa
  • Supriyanto Notohadisuwarno
  • Soeprapto Soekodarmodjo

Abstract

A  study  of  the  soil  moisture  dynamics  and  conservation  resulted  from  the  mulch  adding  and  soil  amendment  was  carried  out  in  the    Laboratory  of  Soil  Science  of  Agriculture  Faculty  of  Gadjah  Mada  University.

            The  experiment  was  conducted  using  a  Factorial  Completely  Randomized  Design  consisting  of  mulch  adding  (Mo  =  without  the  mulch  and  M1  =  with  the  mulch)  and  fourrates  of  soil  amendment  (Po  =  0,  P=  4,  P=  8  and  P3  =  12  Mg.ha-1).  The  experiment  used  Mediteran  top  soil  ( Vertic   Eutropepts ).  Tensiometers  were  installed  at  the  15,  30  and  45  cm  soil  depths  of  all  plots.  Every  treatment  was  repeated  three  times.

            The  soil  properties  which  were  observed  included  particle  size  distributions,  bulk  density,  particle  density,  soil  moisture  characteristic.  Soil  temperature,  saturated  and  unsaturated  hydraulic  conductivity,  organic  matter,  fulvic  acid,  C/N  and  HA/FA  ratios.  Tensoimeter  readings  were  taken  daily,  diurnal  variation  in  soil  temperature  at  a  depth  of  15  cm  and  air  temperature  were  monitored  with  thermometers.

            The  result  of  this  experiment,  generally  speaking,  showed  that  the  mulch  adding  decreases  the  upward  flow  of  the  soil  moisture  and  reduces  the  evaporation  rate  and  then  decreases  the  loss  of  the  soil  moisture.  The  soil  amendment  from  the  green  manure  does  not  have  a  role  to  improve  soil  physical  properties.  However,  it  increases  the  ability  to  hold  the  soil  moisture,  so  the  loss  of  soil  moisture  resulted  from  percolation  is  decreased.  In  fact,  the  role  of  soil  amendment  to  increase  the  soil  moisture  content  is  less  than  the  mulch,  and  then  there  is  no  interaction  between  the  two  factors  which  are  tested.

 

Key  Words  :  mulch,  soil  amendment,  soil  moisture  dynamics,  soil  moisture  conservation.

References

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2017-02-20

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