Mr magoo Charles is an annual farmer who invests in beans, maize and rice utilizing two of his plots for 40 years . During dry season he use s his plot in the swamp for cultivation but during the went season he opts for the plot on hilly grounds which he cleared off trees to grow the other crops .He has observed certain slight deep trenches on the hilly plot since last year and a reduction in his yield and increased number of ball-like structure on the roots of beans he harvested with yellow leaves .He well knows tha rice requires much water so he tries growing it even on hily plot during rainy season but he has never harvested from them a single grain. Respond to him in writing about the reason behind his observations and any piece of advice so as to obtain better yields?