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Adequate nitrogen is essential for the rapid growth and tender, flavorful leaves desirable in salad and brassica greens. Too little may cause yellow, pale leaves , spindly or stunted growth, while an excess of nitrogen may result in soft, watery leaves, attacking insects and nitrate toxicity.
Nitrogen levels change and cycle throughout the growing season, depending on plant growth, moisture and microbial activity.
These are good reasons to shun synthetic nitrogen sources and turn instead to organic amendments, such as alfalfa meal, bloodmeal or bat guano. Just dig them into the soil a week or two before planting.
Even better, with a little planning ahead of time, you could sow a leguminous green manure ( clover, fava beans, hairy vetch, alfalfa) which “fix” nitrogen in the soil from the rhizobial bacteria which clings to legumes’ roots. It’s a less expensive way of fertilizing and more closely follows nature’s own methods.
If you have lots of bean or pea seed left over, you could broadcast the seed a month prior to planting, then turn the green growth into the soil a week before you set out transplants. One more option, the simplest, is to plant brassicas and salad in the same spot where you grew summer beans or peas. This is an easy, beneficial crop rotation.
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