Both Crops Main Crops—Density Constant—Analyses for Each Crop Separately

In the preceding chapter, one crop of the mixture of two crops was considered to be the main crop whose yield was of primary importance. The yield of the second, supplementary, crop was considered to be of secondary importance. The yield of the main crop was not to be reduced or only reduced by a given small percentage if the second crop was to be grown. In the present and following chapters, the two crops of the mixture are considered to be of equal (or specified) importance. That is, the farmer grows both crops as main crops. The two crops need to be evaluated relative to their response in monoculture and in a mixture. The responses of each crop are to be evaluated as is some measure of their joint response. The effect of each crop on the response of the other crop in the mixture needs to be assessed. Within this context, the purpose of the experiment could also include evaluating a number of genotypes of each of the two crops so that best combinations may be chosen for specified climatic conditions. The objectives of these experiments could be maximization of total yield, profit, land utilization, irrigation utilization, insect or disease control, etc., or they could be the study of changes in soil conditions over a period of years for monocultures and for the mixtures of various combinations of the two crops. The objectives might also include an overall evaluation for a combination of previously stated objectives. Different weights could be attached to the various objectives in a given combination.