1. Plant nutrition is a branch of ecology, which studies the interaction between plants and environmental factors, especially the demand and utilization of soil, water and nutrients by plants.

2. Both plant nutrition and ecology study the relationship between biology and environment. Plant nutrition focuses on the response and adaptation of plants to environmental factors, while ecology focuses more on the impact of biological populations, communities and ecosystems on the environment.

3. Both plant nutrition and ecology involve the interaction between biotic and abiotic factors. Plant nutrition mainly focuses on the absorption and utilization of soil, water and nutrients by plants, while ecology pays more attention to the interaction among biological populations, communities and ecosystems.

4. There are many similarities between plant nutrition and ecology in research methods, such as experimental design, field investigation and data analysis.

5. Both plant nutrition and ecology involve the balance and stability of ecosystem. Plant nutrition studies the demand and utilization of nutrients by plants, while ecology pays more attention to the balance and stability among biological populations, communities and ecosystems.

In a word, plant nutrition and ecology are closely related and interact in the development of disciplines. Their combination helps us to understand the interaction between biology and environment more comprehensively and provide scientific basis for environmental protection and sustainable development.