The effect of PFM on the mineralisation of organic fertilisers and its interaction with other agronomic factors such as planting density is also less well-researched. The issue is compounded by horticultural crops (e.g., lettuce) with a high N demand, but which are inefficient at recovering N from soil. Organic systems rely on the supply of nutrients from organic sources (e.g., manures and fertility-building leys) and where poor N availability often limits yield. Their effects on plant-soil-microbial interactions, however, are less well understood. Plastic film mulches (PFM) are used extensively due to their ability to increase yield and suppress weed emergence. 2SoilsWest, Centre for Sustainable Farming Systems, Food Futures Institute, Murdoch University, Perth, WA, Australia.1School of Natural Sciences, Bangor University, Gwynedd, United Kingdom.
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