« j vi^~ V •* v- /.r r»^ »« *j^j " t It -v* ^>'i INCREASE CORN YIELDS sn •Oil INSECTICIDE Weeds in soybeans can easily cut yields by 3 to 9 bushels depending on the seriousness of the weed problem. This winter thousands of farmers who attended the Corn and Soybean Clinics heard informative reports on how to eliminate this loss. Questions on chemicals were most frequent at the recent Corn-Soybean Clinics. Here Roger Didrikson, Shell Chemical Company, attempts to answer a farmer's question on Aldrin. many farmers doubt the need for fertilizers, but just how much to apply is nearly always a matter of concern Soil tests give us a fairly accurate guide to what is in our soils, crop signs can tell us if they are in bad need of a particular element or so, and tissue tests are often valuable tools we can use. But beyond these things, it is more a matter of deciding what kind of a yield we think we should be able to reach. Many things have to be considered: type of soil, past fertilizer and cropping history (including whether a legume crop was plowed down;, price of fertilizer, as well as price of corn or beans, weather cycles, plant population, weed control, kind of hybrid, available capital, whether you are limited in acreage and that certain something that determines a man's ability to make- everything work together for the crop's best interest. As a general guide, for the first 50 bushels of corn increase over 100 bushels, it is necessary to add about 100 pounds of actual nitrogen, 100 pounds of phosphate (PaO 0 ) and 88 pounds of potash (K 2 O), In most cases the efficiency of each pound of plant food after that will decrease rather rapidh Building a high fertilizer program will usually result in not only more money the year of application, but will offer some benefit in years to come. In fact, fertilizer sometimes works better the second year after application with soybeans. Insect control can be accomplished in several ways. Planned crop rotations can reduce infestations, but intensive corn growing leads to serious insect problems. Here, a corn rootworm feeds on a root system. Chemical control and inbred resistance offer the most promise for the future.
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