Abstract

ABSTRACT Yield potential of Italian parsley (Petroselinum crispum), Russian tarragon (Artemisia dracunculus), sweet marjoram (Origanum majorana), and thyme (Thymus vulgaris) was evaluated in multiple harvests from 1993 to 1995. The herbs were grown using a full-bed polyethylene mulch-seepage irrigation system with three nitrogen and potassium rates. In the 1993–94 growth season, plant survival of sweet marjoram and thyme, but not Italian parsley and Russian tarragon, was adversely affected by an increase in soil soluble salt concentrations as the season progressed. Fresh weight yields of sweet marjoram and Italian parsley in the first two harvests of the 1993–94 growth season were maximized at 49 or 98 kg nitrogen/ha and 40 or 80 kg potassium/ha. Maximum Russian tarragon fresh weight yield occurred at 147 kg nitrogen/ha and 120 kg potassium/ha (P < 0.05). Yields of thyme were similar in all harvests at the three nitrogen and potassium rates tested. In the 1994–95 growth season, early fresh weight yields of sweet marjoram, Italian parsley, and thyme were best with the 98 kg nitrogen/ha and 80 kg potassium/ha levels and Russian tarragon fresh weight yields were best at nitrogen and potassium levels similar to the first test year. Nitrogen and potassium rates had little to no effect on macroelement concentrations in herb shoots.

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