Field Crop 2025, Vol.8, No.4, 187-194 http://cropscipublisher.com/index.php/fc 188 2 Conservation Tillage: Principles and Practices 2.1 Definition and types of conservation tillage When it comes to conservation tillage, it is essentially a set of methods that minimize the disturbance to the soil. The core idea is: Don't turn the soil too hard. After harvesting, try to leave the straw on the ground and let it nourish and protect the soil by itself. There are roughly three common practices: no-till (NT), where seeds are directly scattered into the unploughed ground; Strip tillage (ST) involves only breaking soil on the narrow strips where seeds are sown and not touching other areas. There is also less tillage or cover tillage (MT), with a smaller earthwork scale, and most of the stubble remains on the surface (Ahmadi et al., 2025). 2.2 Soil structure and residue management under conservation tillage The benefits of conservation tillage are more reflected in soil structure. Because organic matter accumulates gradually, the aggregates in the soil become more stable and the pore system is less likely to be damaged. The result is that surface water is retained for a longer time, and erosion and nutrient loss are also reduced. Here is a key point-residue management. The straw left in the ground is like a natural protective layer, which can block the erosion of wind and rain, buffer temperature changes, and at the same time return nutrients during decomposition. Over time, both soil fertility and organic carbon content will increase, especially when combined with crop rotation or crop cover (Naeem et al., 2020). 2.3 Comparisons with conventional tillage in barley systems Conventional tillage (CT) practices involve extensive efforts, such as ploughing and harrowing. In the short term, water can seep in quickly and the root system seems to grow vigorously, but in the long run, the soil is often more prone to degradation and nutrient loss is more severe. When compared with the barley system, conservation tillage performed more stably: soil nutrients and organic matter could be maintained or even improved (Lv et al., 2022). However, it is not without cost. For instance, in some clayey and heavy soils, the early emergence rate may be somewhat affected (Damalas and Lithourgidis, 2011). As for yield, no-till barley is generally similar to traditional methods, sometimes slightly lower, but soil health and long-term sustainability make up for this gap (Malecka et al., 2012; Roohi et al., 2022). In addition, conservation tillage can also provide better habitats for natural enemies of pests, thereby reducing the pressure of pests and diseases (Figure 1) (Tamburini et al., 2016). In addition to reducing erosion, lowering energy consumption and improving water use efficiency, it is regarded as a path worth trying for sustainable barley production (Hinkle, 2018). Figure 1 Effect of natural enemy exclusion on mean (±SE) predation index per exclusion treatment and tillage system (grey bars=conservation tillage; white bars = conventional tillage). Crossed-out symbols signify exclusion of corresponding natural enemy guilds. Guilds of natural enemies are as follows: ground-dwelling predators (beetle symbol); vegetation-dwelling predators (ladybird symbol); birds and other vertebrates larger than 1.5 cm (bird symbol) (Adopted from Tamburini et al., 2016)
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