Physiologic factors affecting the germination of seed corn

This publication presents the results of a study of physical and physiological differences that exist between kernels of open-pollinated field corn harvested at different stages of development. Differences in physical characteristics of the kernels and in the rapidity of germination and of breakdown were found to be caused by physiological differences which, in turn, resulted largely from the stage of development at which the kernels were harvested. Studies of the effect of slow as compared with rapid drying, and of the value of selecting seed from plants grown on soil to which superphosphate was added are also reported. It is hoped that the results presented herein will help answer some of the questions pertaining to the effect of the time of gathering and methods of handling of seed corn upon its value as seed

When and How Shall I Plant My Corn?

For five years early and late varieties were planted at three dates at five rates, checked and drilled

The 1945 Iowa corn yield test

The Iowa Corn Yield Test attempts to provide comparable performance records on a relatively large number of hybrid combinations. Some of these on which information is presented are well established strains of known performance while others are new and relatively unknown to most Iowa farmers. Data are presented on each hybrid for yield, stand, moisture, root and stalk lodging, ear height and dropped ears. A performance score has been calculated for use in evaluating the relative agronomic -value o f the hybrids tested. It is believed that the information presented should afford a reliable estimate on the relative performance of a number of hybrids when grown in different areas of the state

The 1943 Iowa corn yield test

The Iowa Corn Yield Test attempts to make available an impartial evaluation of various hybrid combinations in respect to yielding ability, lodging resistance, maturity and other agronomic characteristics. It is believed that the information presented in this bulletin may be of value to both the purchaser and the producer of hybrid corn seed, showing as it does the relative performance of various hybrids in different parts of the state. Data are presented on each entry for yield, stand, moisture, root and stalk lodging, dropped ears, ear height and damaged corn. A performance score has been used as a means of evaluating relative agronomic value of the different hybrids

The 1944 Iowa corn yield test

Each year the Iowa farmer has a multitude of corn hybrids from which he can choose seed for planting. Some are well established strains of proven worth, while others are new and relatively untried. It is impossible to determine, from the appearance of the seed in the bag, the desirability of any particular hybrid. The real test of its value is determined by planting it along with other hybrids to check its field performance. The Iowa Corn Yield Test attempts to provide comparable performance records on a number of hybrids. It is believed that the information presented in this bulletin should afford a reliable comparison of the relative performance of various hybrids when grown in different parts of the state. Data are presented on each entry for yield, stand, moisture, root and stalk lodging, ear height, dropped ears and damaged corn. A performance score has been used in evaluating the relative agronomic value of the various hybrids tested

The 1956 Iowa corn yield test

This bulletin reports the results of the 1956 Iowa Corn Yield Test. The purpose of the report is to provide information to help Iowa farmers select hybrids best adapted for the area in which they live. The presentation of these results does not imply approval or endorsement of these hybrids by any of the cooperating agencies conducting the test. The location of each test field and the division of the state into 12 districts is shown on the map (fig. 1). Each hybrid entry was accepted for testing in one or more districts and planted at two locations within each district. A total of 24 test fields were planted. Six test fields were not harvested because of severe drouth conditions. These were fields 1A, 4A, 5A, 7B, 9A and 10A. The name and address of each cooperator and the dates of planting and harvesting are listed in table A. Plots were planted on land generally better than average for the area. However, there was no attempt to obtain the highest yield possible. Each cooperating farm operator used his customary cultural practices. We did try to locate each test on a field uniform in fertility, contour and past management to eliminate as much soil variation as possible

Relation of certain ear and kernel characters of Reid Yellow Dent corn to yield

Considerable attention has been given to to the possible relationships which may exist between various visible characters in the seed ear and the relative ability of such seed to produce satisfactory yields when planted. The extent to which it is possible to influence the yield of corn by selecting seed with certain ear and kernel characters is a question of practical interest to all corn growers. The practical corn growers of the past, as well as those o f the present, in saving ears for seed, have probably had in mind characters believed to be associated with or contributing to type, maturity, or increased yield

Iowa farmers test new oat varieties

In this bulletin are reported the results secured by Iowa farmers in comparing some of the pure-line pedigreed varieties of oats, which have been developed at the Iowa Agricultural Experiment Station, with the commercial varieties grown in various sections of the state. The farmers carrying on this cooperative experimental work to find the best oat varieties for the different soils and sections of Iowa are well distributed over the state. Comparison of oat varieties at the Iowa station began about the time that field investigations were first established and the new, pure-line, pedigreed varieties which the farmers have been testing are the result of many years of variety comparison and selection. Old varieties were dropped from the tests as their lack of merit became established and new ones were substituted. The results of the first tests were reported in 1889. Later reports were made in 1881, 1908, 1912, and 19181

The 1941 Iowa corn yield test

The Iowa Corn Yield Test attempts to supply performance records to the buyer and producer of various hybrids offered for sale to the Iowa farmer. Iowa has become “hybrid corn conscious” since 1935 when 3.1 percent of the Iowa corn acreage was planted to hybrid seed. In 1941, 95 percent of the corn acreage was estimated to have been planted to hybrid seed. Each year the Iowa farmer is confronted with the problem of knowing which hybrid to buy. The Iowa Corn Yield Test may help in solving this problem by giving some indication of the performance of various hybrids in different parts of the state. Records are determined for acre yield, percent stand, lodging, moisture, dropped ears and damaged kernels. Significant differences in yield and in other characteristics between hybrids, providing they are equal in stand, grown under the same environmental conditions may be attributed to genetic differences