According to new research, information regarding soil health is often too generalised. Locally sourced data will help farmers use the best practices for their land.
Farmers can use a variety of practices to keep their soils healthy. Some of these practices include not tilling the land, planting cover crops between growing seasons and rotating the type of crop grown on each field.
Soil health difficult to define
However, research published in Agricultural & Environmental Letters, notes that information regarding soil health is often too generalised.
“Soil health is difficult to define, measure and track over time, although methods are improving,” says Grace Miner, Grace Miner, a postdoctoral scientist at Colorado State University and member of the American Society of Agronomy, Crop Science Society of America and Soil Science Society of America. “Linking changes in soil health to farm management is complex.”
Not all outcomes are equal amongst farms. While one practice may benefit one, it may bring challenges to another depending on location. In the United States for example, these challenges stem from the United States having diverse geography.
Best farming practices need to be understood at regional level
“We recognise there are potential benefits with soil health, but caution against blanket statements,” says Miner. “The best farming practices, in terms of costs and benefits, need to be understood at the regional level. What works for someone in Colorado may not work in Wisconsin.”
There are many factors that affect the outcomes of soil health management on a farm. Soil health improvement is often a lengthy process that depends on things like soil type, climate, cropping system and available tests.
“Healthy soils are the foundation for food production,” says Miner. “We need to pursue the most sustainable and economical forms of production. But outcomes need to be understood over a long range of time at regional levels.”
Text continues underneath image
A researcher collects a soil sample from a long-term research plot. - Photo: Bradley Floyd
Identifying pros and cons of different farm management systems
Researchers emphasise the importance of identifying the pros and cons of different farm management systems. Consideration of soil health, yield and nutritional quality need to be taken. For some, decisions may need to be made in terms of farmer goals.
Miner notes that generalisations are useful to a point. But to answer questions about how farm management practices impact soil health, yields and other outcomes, practices need to be tested at a regional scale for multiple years.
“Locally sourced data will help farmers use the best practices for their land,” says Miner. “The investment and outcomes involved over time is a complex, yet worthwhile challenge.”
Crop yield and nutritional quality
The question of whether healthier soils will lead to a better nutritional value of crops is another area of research. Improving the soil health doesn’t automatically mean the crop yield and nutritional quality will increase.
“In some crops, the mineral nutrient quality goes down as yields go up,” explains Miner. “It’s dependent on the type of crop and the growing environment, among other factors.”
Important questions to answer
The goal is to understand the most regionally appropriate farm management practices, says Miner. “Meeting future global food demands while responsibly caring for the land is a grand challenge before us. There are important questions to answer in terms of soil health, crop production and nutritional quality. By investing time, energy and funding into these questions at the regional scale, we can determine the benefits of soil health management practices for farmers.”