Agronomic Measures for Soil Water Conservation

The question asks to identify an agronomic measure for soil and water conservation. Agronomic measures are farming practices that improve soil health and reduce erosion and water runoff.

Analyzing Conservation Options

Let's examine each option:

• Vegetative barriers: These involve planting strips of grass, legumes, or other dense vegetation across slopes or along contours. They intercept runoff, reduce its velocity, and trap sediment. This is a direct farming practice applied within the agricultural landscape.
• Contour bunding: This involves building small dams (bunds) along the contour lines of the land. While effective for water and soil conservation, it's often considered a civil engineering or mechanical measure rather than purely agronomic.
• Afforestation: This is the process of planting trees on land that was not previously forested. While excellent for soil and water conservation on a larger scale, it is a forestry practice, not typically classified as an agronomic measure which focuses on crop production systems.
• Conservation ditching: This involves excavating ditches to control and manage surface water runoff. It is primarily a civil engineering or land management technique, not an agronomic practice related to cropping.

Identifying the Agronomic Measure

Comparing the options, vegetative barriers are the most fitting example of an agronomic measure. They are implemented directly within the farming system using plant materials to manage soil and water resources during crop production.