Some algae growing in the water fix atmospheric nitrogen. Weed Control 1. Redweed Spike rush 2. Most of these can be suppressed by herbicides. Seeding in water will suppress barnyard grass.
Crop rotation is effective.
Blue green algae controlled by adding copper sulfate to water. Rice is usually harvested with self-propelled combines which are equipped with large rubber tires and mud lugs, or with crawler tractors. It is dried promptly with heat. At this stage, kernels in the lower portion of the heads are in the hard dough stage while those in the upper portion are ripe 4. If short season varieties are sown early, a second rotation crop can be harvested in the same season.