Abstract
Corn stalk lodging, which involves the breakage of the stalk below the ear following either bad weather, insect infestation or stormy rain, usually leads to harvest loss, increased harvesting time and higher drying costs. The objective of this study was to develop a method that can classify corn stalk lodging resistance. This method, which employed the maximum equivalent force exerted on a corn stalk, corresponding stalk agronomic traits, and the singular value decomposition (SVD) algorithm, showed that the five corn varieties with different stalk lodging resistance from two planting densities of 60,000 plants/ha and 75,000 plants/ha can be effectively classified. A customized device was designed to measure the equivalent forces. Three factors, including the planting density, the stalk diameter, and the maximum equivalent force with comprehensive contributions of −0.4603, 0.4196 and 0.4068, which are related to principal components, play an important role in the classification of corn stalk lodging resistance. The results showed that the corn stalk lodging resistance decreased with increase in planting density; however, with the increase in stalk diameter and maximum equivalent force, the lodging resistance significantly increased. Corn breeders can develop higher lodging resistance-based corn varieties by using this approach.
Highlights
Reduction of yield in corn at harvest has been estimated from 5% to 20% per year globally [1].Stalk lodging resistance is one of the major factors that influence on both yield and quality of corn.Accurate information about the properties of corn stalk lodging resistance has not been obtained due to field experimental limitations [2]
Agronomic traits, the maximum equivalent forces, and corresponding stalk lodging angles were measured for the five corn varieties with two planting densities of 60,000 plants/ha and
The statistical results show that the average lodging rates of DH605 (60,000), DH605 (75,000), and ZD958 (60,000) were relatively lower than other corn varieties, and the most serious lodging stalks happened in the corn variety of XD20 (75,000), XD20 (60,000), and YD606 (75,000)
Summary
Reduction of yield in corn at harvest has been estimated from 5% to 20% per year globally [1].Stalk lodging resistance is one of the major factors that influence on both yield and quality of corn.Accurate information about the properties of corn stalk lodging resistance has not been obtained due to field experimental limitations [2]. Stalk lodging resistance is one of the major factors that influence on both yield and quality of corn. The stalk lodging rate is influenced by the same factors (i.e., internode length and thickness). Both stalk and root lodging occur under strong winds before harvest. Selection of corn varieties possessing high lodging resistance depended on counting lodged plants by harvest [4]. This method, is disadvantageous, as a high coefficient of variation is frequently produced by various uncontrolled environmental factors such as wind and rain storms [5,6,7]. A harsh wind storm may lead to flattening of a whole
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