Abstract
Decomposition of organic matter releases humic compounds, that can chelate metals include Al in acidic soils. This chelation of Al is important fordecreasing of Al activity and P fixation in acidic soils. This study was aimed to test the effect of humic compounds extracted from rice-straw compost and CaCO3 combination on aluminium activity and phosphate (available P) on an Ultisol (Typic Paleudult) collected from Kentrong Banten. A laboratory study was conducted by series consentration of CaCO3 (0, 500, 1.000, 2.000, dan 3.000 ppm) in 8 grams of acidic soil. The acidic soil had previously been subjected to continuously addition of humic compounds and none. Then, these mix of soil and CaCO3 were added 40 ml contained 5.000 ppm humic compounds to obtain 1:5 soil:suspension ratio and control was made by using aquadest. They were shaked for 2 hours every day and pH was measured. At 11st days incubation Alexch (N KCl) and soluble of P (PB and PC) were measured. The results showed that liming or addition of CaCO3 to the acidic soils decreased Alexch (precipitated to be Al(OH)3) linearly with formula y = -0.778x + 6.108; y = Alexch (Cmol kg-1), x =CaCO3 (M); R² = 0,916. Combination addition of humic compounds and CaCO3 was able to increase pH and Alexch up to not detected. The increased of P-soluble or desorption P untill 384% took place at addition of 0.0016 M CaCO3 and 5000 ppm humic compounds. More desorption of P was observed if the acidic soils has previously been subjected to continuously addition of humic compounds, such us the increased of soluble P up to 739% at addition of CaCO3 0.0008 M.
Highlights
IntroductionWbisodpaesnteeirxhnutsecheaoddsnsemiusyotsosdptelSastivii.hfdnsrueinroetTcmelsurtaohhneoutararedurfgtirirfresssaigaarcnenecati(tieosiPespcunsi)pfpnolitmttgapral,nsiouctdueairnnartstede.todghtceyifTiotlorfcyoeIiownenaud(Doeidltatnd,edbfovOflwdyiolnceutMbiehahddecyssea)hfncisrtatenhcaooanedemcemmneagrdderitsacihtcitcbthradhieearvyiieeiJdegbmfkemlaneoaaietunwtiinimdntrotdlidlrdhti.noigelioTueopeanfshnfrrpsttyceeatilaaos-cpp#sdloGpnaapncdennramluyasitddcoltytws*eriatfsoci"hiietetiatrenerihnolrprmdbitatenglbolcm.aaccoawtnrthiafIlievlnaokaantaihentrnanitatiedeghcsdcssedeetypa,mer,sshumrrweotoiwpeesonvmphmthutiimneceiin,llcresetocdaeuFshoistllstoeodorftocacmwtontrmi,ahnmgeeicelsrptraihntmanahlateonaenenifncrtdcaedersaiamredlrafoltcirsicpoveflibieeeeuzayinnr-senictlhrdiatrTulnsoilbzhloyouatwlieefusevptrpncaopsSnehtotlaSaiitnieocmhtpidranmneapeoetsmnliigedioucidcnaenansasdDnvnltoaaiiisOcrofrlgoe(heiandMNenoart'tinmu)oi(wTlrSllinoedeazhSinbantneioh)stetdd,rf base on site specific characteristic and uking into account ofnatural source contribution' Keywords:Cascade irrigation" chemical fertilizer' nutrient balance, terrace paddy field
West Sumatra lies in equator line and enjoys rain and sun shine whole year round' Since the landscape of this province dominated by mountainous area, cascade irrigation system has brcome the main choice to irrigate large amount of
The main purpose of this research was to study the characteristic of P and N movement in intensive terrace paddy field occupied by cascade irrigation in West Sumatra, Indonesia, named as terrace I to V
Summary
WbisodpaesnteeirxhnutsecheaoddsnsemiusyotsosdptelSastivii.hfdnsrueinroetTcmelsurtaohhneoutararedurfgtirirfresssaigaarcnenecati(tieosiPespcunsi)pfpnolitmttgapral,nsiouctdueairnnartstede.todghtceyifTiotlorfcyoeIiownenaud(Doeidltatnd,edbfovOflwdyiolnceutMbiehahddecyssea)hfncisrtatenhcaooanedemcemmneagrdderitsacihtcitcbthradhieearvyiieeiJdegbmfkemlaneoaaietunwtiinimdntrotdlidlrdhti.noigelioTueopeanfshnfrrpsttyceeatilaaos-cpp#sdloGpnaapncdennramluyasitddcoltytws*eriatfsoci"hiietetiatrenerihnolrprmdbitatenglbolcm.aaccoawtnrthiafIlievlnaokaantaihentrnanitatiedeghcsdcssedeetypa,mer,sshumrrweotoiwpeesonvmphmthutiimneceiin,llcresetocdaeuFshoistllstoeodorftocacmwtontrmi,ahnmgeeicelsrptraihntmanahlateonaenenifncrtdcaedersaiamredlrafoltcirsicpoveflibieeeeuzayinnr-senictlhrdiatrTulnsoilbzhloyouatwlieefusevptrpncaopsSnehtotlaSaiitnieocmhtpidranmneapeoetsmnliigedioucidcnaenansasdDnvnltoaaiiisOcrofrlgoe(heiandMNenoart'tinmu)oi(wTlrSllinoedeazhSinbantneioh)stetdd,rf base on site specific characteristic and uking into account ofnatural source contribution' Keywords:Cascade irrigation" chemical fertilizer' nutrient balance, terrace paddy field. Lndonesia is the third rice producing countries in the world after China and lndia. In 2007, China produced 185.5 million tons rice, followed by India. To supply rice for such huge population' the fbod glaln produced in 7.8 million hertate paddy field distributed in the whole country including West Sumatra. Total paddy field area in West Sumatra just about 250 thousand hectare, but due to the high productivity this province has been supplied rice to other province nearby. West Sumatra lies in equator line and enjoys rain and sun shine whole year round' Since the landscape of this province dominated by mountainous area, cascade irrigation system has brcome the main choice to irrigate large amount of
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