Soil compaction stress can strongly affect plant growth, development and productivity. Effects of different levels of soil compaction were investigated in 18 maize hybrids during field and greenhouse experiments. Maize hybrids in the field experiments were subjected to low (L) or high (H) and in the greenhouse experiments to low (L: 1.10) and high (C: 1.60 g cm⁻³ soil) soil compaction level. Differences between maize hybrids grown under non-stress and stress conditions were found in a decrease in grain yield (GY), grain number (GN), weight of 1,000 grain (W-1000), seedling dry matter (DM), emergence (EM), plant height (H), leaf area (LA) and leaf greening (SPAD). Stress susceptibility index (SSI), geometric mean productivity index (GMP) and tolerance index (TI) were evaluated by determining the effects of low (L) or high (H) soil compaction levels on grain yield (GY) or dry matter of the above-ground part (DM). The values of SSI, GMP and TI enabled us to rank the tested hybrids with respect to their susceptibility to soil compaction stress. SSI and TI made it possible to identify maize hybrids resistant and sensitive to soil compaction stress. Changes in growth traits were greater in the hybrids with high SSI and TI. Correlation coefficient (r) between stress susceptibility index (SSI) of maize hybrids in the field and greenhouse experiment was high and statistically significant. This observation may indicate that genetically determined susceptibility to soil compaction stress in maize hybrids was similar throughout ontogenesis.

中文翻译：

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玉米杂交种（Zea mays L.）对土壤压实胁迫响应变化的选择方法

土壤压实胁迫会严重影响植物的生长，发育和生产力。在田间和温室试验中，对18种玉米杂交种进行了不同程度的土壤压实效果的研究。在田间实验中对玉米杂交种进行低（L）或高（H）处理，在温室实验中对玉米杂交种进行低（L：1.10）和高（C：1.60 g cm ^-3土）压实程度。在非胁迫和胁迫条件下生长的玉米杂交种之间的差异在于谷物产量（GY），籽粒数量（GN），1,000谷物重量（W-1000），幼苗干物质（DM），出苗（EM）的下降），植物高度（H），叶面积（LA）和叶绿化（SPAD）。通过确定低（L）或高（H）土壤压实水平对小麦籽粒产量（GY）或干物质的影响，评估了应力敏感性指数（SSI），几何平均生产率指数（GMP）和耐受指数（TI）。地上部分（DM）。SSI，GMP和TI的值使我们能够对被测杂种对土壤压实应力的敏感性进行排名。SSI和TI使人们能够鉴定出对土壤压实胁迫具有抗性和敏感性的玉米杂交种。高SSI和TI的杂交种的生长性状变化更大。相关系数（r）在田间和温室试验中，玉米杂交种的胁迫敏感性指数（SSI）高，并且具有统计学意义。该观察结果可能表明，遗传确定的玉米杂种对土壤压实胁迫的敏感性在整个成虫过程中是相似的。