Influence of silicate and sulfate sources on phosphorus sorption and corn yield / Conrado M. Duque, Sr.
Material type:
TextLanguage: English Publication details: Los Baños, Laguna : 1990. Cavite State University- Main Campus,Description: 188 pages : illustrations ; 28 cmContent type: - text
- unmediated
- volume
- 631.4 D92 1990
| Item type | Current library | Collection | Call number | Materials specified | URL | Status | Notes | Date due | Barcode |
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Theses / Manuscripts
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Ladislao N. Diwa Memorial Library Theses Section | Non-fiction | 631.4 D92 1990 (Browse shelf(Opens below)) | Link to resource | Room use only | T-1473 | 00002334 |
Thesis (Ph.D. - - Soil Science) University of the Philippines, College, Laguna.
Includes bibliographical references.
DUQUE. CONRADO M.. Sr. University of the Philippines at Los Banos. College, Laguna. January 1990. Influence of Silicate and Sulfate Sources on Phosphorus Sorption and Corn Yield. Major Professor: Dr. Henry P. Samonte
The potential of competitive anion adsorption for phosphate. Using silicate and sulfate as a possible management strategy to increase phosphate availability to corn was tested on two extremely acidic, phosphorus deficient soils, Luisiana clay and Adtuyon clay. This study was conducted with the following objectives: a) to evaluate the effects of calcium, magnesium. potassium and sodium silicates on P sorption. available P and dry matter yield of corn. b) to evaluate the eftects of calcium. magnesium, potassium and sodium sulfates on P sorption. available P and dry matter yield of corn. and c) to evaluate the effects of calcium silicate and calcium sulfate on available P. soil pH, exchangeable aluminum and grain yield of corn.
Application of 250 ppm and 500 ppm silicate in the form of calcium Silicate on Luisiana clay decreased the P sorption maximum of the soil from 2.4522 to 2.4237 and 2.2969 mg P g™!, respectively. Other silicate sources had lesser effect than calcium silicate in decreasing the P sorption maximum of the soil. Sulfate application resulted to a _ very slight decrease in the P sorption maximum of the soil.
On Luisiana clay not fertilized with phosphorus. application of different silicate and sulfate compounds did not increase dry matter yield of corn but phosphorus application resulted in significantly higher dry matter yield. Combined application of 160 ppm P and 250 ppm Silicate as calcium silicate and potassium silicate significantly increased dry matter yield of corn.
On Adtuyon clay, the application of either 60 kg P305 per hectare. 120 kg P205 per hectare or 250 kg silicate per hectare as calcium Silicate significantly decreased exchangeable aluminum. $011] pH significantly increased with the application of either 250 kg silicate per hectare as calcium silicate or 120 kg P05 per hectare. Soil P test value increased significantly with the application of 60 and 120 kq P205 per hectare. The application of silicate and sulfate alone or in combination with phosphorus did not increase soil P test value at silking stage over the P treatments. Silicate and sulfate application alone however, resulted in significantly higher concentration of Phosphorus in corn plants. Grain yield and P uptake of corn increased significantly with the application of either 250 kg silicate per hectare as calcium silicate, 100 kg sulfate per hectare as calcium sulfate. 60 kg P205 per hectare or 120 kg P205 per hectare.
Silicate and sulfate application alone slightly reduced P Sorption, did not increase soil P test values but increased soil pH. decreased exchangeable aluminum. increased P concentration in corn Plants, increased P uptake and grain yield of corn.
Submitted to the University Library 01/07/1994 T-1473