PHYSICALLY weak seedlings such carrot, lettuce, onion, and beet fail to emerge because of premature drying, accumulation of salts in shallow seedbeds, or from not being to break through even weak soil. To insure adequate stands of crops, excess seed is often planted later requires time-consuming and thinning. Precision planting that eliminate hand labor and are needed. Any such method insure a consistently high emergence seedlings under the variety of and soil conditions which encountered from year to year the planting period.
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Heinemann et al. (1973) studied this question.
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