1994 journal article
A HUMIC-ACID IMPROVES GROWTH OF TOMATO SEEDLING IN SOLUTION CULTURE
JOURNAL OF PLANT NUTRITION, 17(1), 173–184.
1991 journal article
Effects of applied humic acids on yield, growth, nutrient accumulation/content in selected vegetable crops and soil interactions that reduce their effectiveness
Dissertation Abstracts International. B, Sciences and Engineering, 52(3), 1136.
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