References:
A&L LABS, Modesto, Ca.
Field Trials of Tomatoes, Agronomy Associates, Fresno, Ca., 1988-1992
Piccolo, Alessandro, 1996
Piccolo and Pietramellara, 1994
Fortune et. al., 1989
Thornton, Seyedbagheri and Thornton, 1993. Proceedings, 32nd Annual Washington State Potato Conference and Trade Fair, Use of Humic Acid in Potato Production, pp. 39-45.
Field Trials on cotton in Kerman, Ca., Agronomy Associates, 1995-1997 |