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Published in Soil Sci Soc Am J 46:328-331 (1982)
© 1982 Soil Science Society of America
677 S. Segoe Rd., Madison, WI 53711 USA
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Response of Corn and Inoculated Legumes to Urea, Lime, Phosphorus, and Sulfur on Guadalupe Clay1

U. S. Jones2, H. P. Samonte3 and D. M. Jariel3

ABSTRACT

Responses of soybean (Glycine max L.), mung bean (Vigna radiata L.), and corn (Zea mays L.) to CO(NH2)2, CaCO3, Ca(H2PO4)2·H2O, and CaSO4, and of legumes to single strain Rhizobium inoculants on a Vertisol was determined during the dry season at Los Banos, Philippines. Irrigation well water and precipitation were used to maintain soil moisture slightly below saturation in 6-kg crocks. Relevant chemical analyses were made on soils, water, and plants. Inoculation increased N concentration of soybean tops. Soybean yield was greater with seed inoculation before planting than without, but mung bean did not respond to seed inoculation before planting. Neither legume responded to 30 kg N/ha as urea. Nodules on legume roots were greatly increased by 40 kg P/ha. All yields were more than doubled by addition of 40 kg P/ha. Increased yield of corn and soybeans resulted from the addition of 20 kg S/ha. The addition of sulfur as CaSO4 resulted in an increased soil S concentration as measured by dilute NH4C2H3O2, CH3COOH extraction.

NOTES

1 Technical Contribution no. 1,886 of the South Carolina Agric. Exp. St., Clemson University.

2 Professor, Dep. of Agronomy and Soils, Clemson Univ.

3 Assoc. Professor and Graduate Student, respectively, Dep. of Soil Science, Univ. of Philippines, Los Banos.

Received for publication February 5, 1981. Accepted for publication October 6, 1981.






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Copyright © 1982 by the Soil Science Society of America.