Oktalaseva, Wetria
(2014)
KARAKTERISTIK KESUBURAN TANAH DAN POTENSI HARA DARI BAHAN ORGANIK
SISA PANEN PADI SAWAH PADA BEBERAPA LOKASI DI SUMATERA BARAT.
KARAKTERISTIK KESUBURAN TANAH DAN POTENSI HARA DARI BAHAN ORGANIK SISA PANEN PADI SAWAH PADA BEBERAPA LOKASI DI SUMATERA BARAT
.
(Unpublished)
Abstract
The aim of this research was to determine the characteristics and potential contribution of
nutrients from residues of rice biomass and roots as well as the relationship between soil fertility
characteristics and nutrient stocks in rice field intensifications in West Sumatra. This study was
conducted by using survey methods and field observations at three locations, in Buayan, Anduring,
and Aie Angek, from August 2012 to December 2012. The results showed that the nutrient status
of the soil : pH was slightly acid, organic-C, total-N, Ca-exchangeable and C/N ration in Buayan >
Anduring > Aie Angek. On other hand, the opposite or order was found for P-available, K- and
Mg-exchangeable. The nutrient contribution of rice stubble and root biomass to C and K indicated
that in Buayan > Aie Angek > Anduring, and N in Buayan > Anduring > Aie Angek, P, Ca and
Mg in Aie Angek > Anduring > Buayan. Average nutrient contribution of residual biomass of rice
stubble and roots (kg/ha/season) in Buayan; N=166.21; P=2.39; K=7.49; Ca=2.77; Mg=12.38; an
in Anduring; N=146.78; P=3.37; K=5.96; Ca=2.20; Mg=6.55; and in Aie Angek; N=140.54;
P=8.86; K=7.79; Ca=2.68; Mg=7.53. Stock of soil nutrients (kg/ha) in Buayan, N=6,760.00;
P=32.03; C=10.92; Ca=18.40; Mg=30.00, and in Anduring; N=4,420.00; P=50.41; K=18.72;
Ca=16.80; Mg=32.88, and in Aie Angek, N=2,840.00; P=64.86; K=8.58; Ca=14.80; Mg=38.16.
Contribution of nutrients from residual of rice stubble and roots was positively correlated with the
stock of soil nutrients such as N, P, Ca-exchangeable and C-organic.
Keywords: organic matter, biomass, soil fertility, paddy ,rice field, stubble residues, rice root.
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