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Agrostis alkaline alkaline reaction annual Plant applied bacteria blood manure bowling green breathing broad-leaved weeds calcium called carbohydrates carbon cent P2O5 chemical chlorophyll clay clover colour compounds contain Copyright Crane Fly crops decomposition degree of acidity drainage drained drought earthworm effect element energy feeding Fescue Festuca fungi fungus gardener grass plant green plant grow growth heavy soil hoof and horn hormones horticultural hydrogen hydroxyl hydroxyl ions inorganic larvae lawn lead arsenate leaves material Meadow Grass mineral needs nitrogen nitrogenous fertilizer nutrient substances nutrition organic fertilizer organic matter oxygen parasitic particles pest Phleum pratense phosphoric acid phosphorus deficiency plays popularly potash potassium produce rapid root system seedling soil reaction soluble sown species of grass sports ground stems stomata suitable for turf sulphate of ammonia superphosphate superphosphate of lime supply surface sward synthetic tion tissue turf cultivation turves usual analysis worms young grass