The Layout of Maize Variety Test Sites Based on the Spatiotemporal Classification of the Planting Environment

Xuli Zan, Zuliang Zhao, Wei Liu, Xiaodong Zhang, Zhe Liu, Shaoming Li and Dehai Zhu
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Xuli Zan: College of Land Science and Technology, China Agricultural University, Beijing 100083, China
Zuliang Zhao: College of Land Science and Technology, China Agricultural University, Beijing 100083, China
Wei Liu: College of Land Science and Technology, China Agricultural University, Beijing 100083, China
Xiaodong Zhang: College of Land Science and Technology, China Agricultural University, Beijing 100083, China
Zhe Liu: College of Land Science and Technology, China Agricultural University, Beijing 100083, China
Shaoming Li: College of Land Science and Technology, China Agricultural University, Beijing 100083, China
Dehai Zhu: College of Land Science and Technology, China Agricultural University, Beijing 100083, China

Sustainability, 2019, vol. 11, issue 13, 1-15

Abstract: An appropriate layout of crop multi-environment trial (MET) sites is imperative for evaluating new crop varieties’ performance in terms of agronomic traits and stress tolerance, and this information is used to determine the utilization value and suitable promotion region of new varieties. Actually, traditional maize test sites have been selected according to the experience of breeding experts, which leads to the strong subjective and unscientific conclusions regarding sites, as well as test results that are not representative of the target population of environments (TPE). Therefore, in this study, we proposed a new method for MET sites layout. Meteorological data, maize growth period data, and county-level maize planting area data were collected for the spatiotemporal classification of a given maize planting region to analyze change rules in the environmental category of each minimum research unit within the study period. If the occurrence frequency of its final attribution category reaches a certain threshold (50%), this minimum research unit is classified as a typical environment region; otherwise, it is classified as an atypical environment region. Then, the number of test sites in each environmental category is allocated by spatial stratified sampling. At last, we establish the optimal test sites layout and a reliability measurement (test adequacy) methods. The practicability of this method was proved by taking the Three Northeastern Provinces of China as the study area. The result shows that there should be 112 test sites in the study area, the distribution of the test sites is uniform, and the environmental representation is high. Test adequacy analysis of the test sites reveals that most of the environmental categories have a test adequacy that reaches 1 in each test period. The method proposed in this paper provides support for the scientific layout of crop varieties test sites and helps to improve the representative and reliability of variety test results while optimizing resources.

Keywords: maize; Multi-environment trials; test sites layout; spatiotemporal classification; spatial stratified sampling; GIS (search for similar items in EconPapers)
JEL-codes: O13 Q Q0 Q2 Q3 Q5 Q56 (search for similar items in EconPapers)
Date: 2019
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (1)

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