Common wheat "Triticum compactum", but in India "T. sphaerococcum") are closely related to common wheat, but have a much more compact ear. Their shorter rachis segments lead to spikelets packed closer together. Compact wheats are often regarded as subspecies rather than species in their own right (thus "T. aestivum" subsp. "compactum"). Common wheat Common wheat ("Triticum aestivum"), also known as bread wheat, is a cultivated wheat species. About 95% of the wheat produced is common wheat, which is the most widely grown of all crops and the cereal with the highest monetary yield. Numerous forms of wheat have evolved under human selection.
Crop rotation crop rotation comes from the interrelationship of nitrogen fixing-crops with nitrogen demanding crops. Legumes, like alfalfa and clover, collect available nitrogen from the soil in nodules on their root structure. When the plant is harvested, the biomass of uncollected roots breaks down, making the stored nitrogen available to future crops. Legumes are also a valued green manure: a crop that collects nutrients and fixes them at soil depths accessible to future crops. In addition, legumes have heavy tap roots that burrow deep into the ground, lifting soil for better tilth and absorption of water. Cereal and grasses are frequent cover