On December 3, 2012, Jonathan Latham of Independent Science News published an article entitled, How Millions of Farmers are Advancing Agriculture for Themselves. The lengthy article describes the principles and origins of the “System of Rice Intensification”(SRI), a method* of growing rice derived from the empirical work started in the 1960s by a French priest in Madagascar. ”SRI has shown remarkable capacity to raise smallholders’ rice productivity under a wide variety of conditions around the world,” simply by changing how “farmers manage their plants, soil, water and nutrients.” The system is now being adapted to improve the productivity of a wide variety of other crops, including wheat, finger millet and sugarcane. This is from the article’s introduction:
The world record yield for paddy rice production is not held by an agricultural research station or by a large-scale farmer from the United States, but by Sumant Kumar who has a farm of just two hectares in Darveshpura village in the state of Bihar in Northern India. His record yield of 22.4 tons per hectare, from a one-acre plot, was achieved with what is known as the System of Rice Intensification (SRI). To put his achievement in perspective, the average paddy yield worldwide is about 4 tons per hectare. Even with the use of fertilizer, average yields are usually not more than 8 tons.
Sumant Kumar’s success was not a fluke. Four of his neighbors, using SRI methods, and all for the first time, matched or exceeded the previous world record from China, 19 tons per hectare. Moreover, they used only modest amounts of inorganic fertilizer and did not need chemical crop protection.
Using SRI methods, smallholding farmers in many countries are starting to get higher yields and greater productivity from their land, labor, seeds, water and capital, with their crops showing more resilience to the hazards of climate change (Thakur et al 2009; Zhao et al 2009).
These productivity gains have been achieved simply by changing the ways that farmers manage their plants, soil, water and nutrients.
The effect is to get crop plants to grow larger, healthier, longer-lived root systems, accompanied by increases in the abundance, diversity and activity of soil organisms. These organisms constitute a beneficial microbiome for plants that enhances their growth and health in ways similar to how the human microbiome benefits Homo sapiens.
That altered management practices can induce more productive, resilient phenotypes from existing rice plant genotypes has been seen in over 50 countries. The reasons for this improvement are not all known, but there is agrowing literature that helps account for the improvements observed in yield and health for rice crops using SRI.
The ideas and practices that constitute SRI were developed inductively in Madagascar some 30 years ago for rice. They are now being adapted to improve the productivity of a wide variety of other crops, starting with wheat, finger millet and sugarcane. Producing more output with fewer external inputs may sound improbable, but it derives from a shift in emphasis from improving plant genetic potential via plant breeding, to providing optimal environments for crop growth.
The adaptation of SRI experience and principles to other crops is being referred to generically as the System of Crop Intensification (SCI), encompassing variants for wheat (SWI), maize (SMI), finger millet (SFMI), sugarcane (SSI), mustard (rapeseed/canola)(another SMI), teff (STI), legumes such as pigeon peas, lentils and soya beans, and vegetables such as tomatoes, chillies and eggplant.
That similar results are seen across such a range of plants suggests some generic processes may be involved, and these practices are not only good for growing rice. This suggests to Prof. Norman Uphoff and colleagues within the SRI network that more attention should be given to the contributions that are made to agricultural production by the soil biota, both in the plants’ rhizospheres but also as symbiotic endophytes within the plants themselves (Uphoff et al. 2012).
The evidence reported [in this report] has drawn heavily, with permission, from a report that Dr. Uphoff prepared on the extension of SRI to other crops (Uphoff 2012). Much more research and evaluation needs to be done on this progression to satisfy both scientists and practitioners. But this gives an idea of what kinds of advances in agricultural knowledge and practice appear to be emerging.
~~~Happy, Healthy, Safe Farming, Eating, Living~~~