Vegetable crop production; vegetable physiology and cultural practices.
Hassell, R. H. and D.W. Kretchman. 1997. The effect of umbel order, soaking and scarification on germination inhibiting substances in Petroselinum Crispum L. and other Apiaceae seeds. HortScience 32:1227-1230.
Hassell, R.H. and D.W. Kretchman. Influence of seeding rates, irrigation, spacing and soil type on stand establishment of parsley Petroselinum Crispum L. HortTechnology (in review). 1997.
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