Maximum yield research: Proceedings of symposium on maximum yield research, November 16-18, 1988, New Delhi / Potash Research Institute of India - Haryana: Potash Research Institute of India, 1989 - vi, 212p. Subjects--Topical Terms: Agriculture Subjects--Index Terms: Philosophy Yield research Universal Decimal Class. No.: I 631. 559:631.8(082.2) / M9