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Too much nitrogen is accompanied by too little sugar, and vice versa. Naturally, and generally, higher sugar levels are encouraged by longer days and short cooler nights. They also are encouraged by less frequent, deeper watering. So nitrogen levels can be controlled in controlled environments such as greenhouses. Outside, sugar levels can be encouraged by deeper applications of fertilizer. Aeration holes dug down well below the root zone control the speed with which nitrogen is taken in, and the amounts. Also, in the specific case of ornamental grasses, root prune in early summer. Draw a circle, mentally or in actuality, on the ground around the ornamental grass. Then dig a spade down to cut off the furthest parts of the roots. No more than a third of the total root system, and of the drawn/mental circle, should be pruned. But the diggings, and prunings, should be spaced instead of next to each other. Root pruning stimulates the release of stored carbohydrates, etc. The consequence will be higher sugar levels, lower nitrogen. In grasses, higher nitrogen levels tend to be in the leafy parts. Lower nitrogen levels tend to be in the roots, nodes, and seeds. Keep that in mind when setting mowing heights.

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Q: How do you lower nitrogen levels in grass?
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