Volcanic fertilization of Balinese rice paddies

Abstract Since the advent of high-yielding ''Green Revolution'' rice agriculture in the 1970s, Balinese farmers have been advised to supply all the potassium and phosphate needed by rice plants via chemical fertilizers. This policy neglects the contribution of minerals leached from the volcanic soil and transported via irrigation systems. We documented frequent deposition of volcanic ash deposits to rice producing watersheds. Concentrations of phosphorus in rivers were between 1 and 4 mg l − 1 PO 4 , increasing downstream. We measured extractable potassium and phosphate levels in the soils of unfertilized Balinese rice paddies, and found them to be indistinguishable from those in fertilized paddies, and sufficient for high grain yields. Field experiments varying phosphorus applications to rice fields from 0 to 100 kg superphosphate per hectare (7-26 kg P ha − 1 ) demonstrated small increases in harvest yields only with the smallest additions. Direct measurements of PO 4 in irrigation waters indicate that most of the added phosphate flows out of the paddies and into the river systems, accumulating to very high levels before reaching the coast

Social science in a water observing system

Peer Reviewedhttp://deepblue.lib.umich.edu/bitstream/2027.42/95008/1/wrcr12336.pd

John Stephen Lansing's Quick Files

The Quick Files feature was discontinued and it’s files were migrated into this Project on March 11, 2022. The file URL’s will still resolve properly, and the Quick Files logs are available in the Project’s Recent Activity

The University Of Michigan Center for South and Southeast asian Studies

ix.104 hal.;23 c

Rama's Kingdoms: Social Supportive Mechanisms For The Arts In Bali.

PhDCultural anthropologyUniversity of Michigan, Horace H. Rackham School of Graduate Studieshttp://deepblue.lib.umich.edu/bitstream/2027.42/180773/2/7804746.pd

Priests and Programmers Technologies of Power in The Engineered Landscape of Bali

xvi.182 hal.;ill.;24 c