Abstract: A watering and fertilizing device comprises at least one fertilizing column and a water supply system. The fertilizing columns are vertically inserted in soil, surrounding roots of a plant to be watered. Water from the water supply system enters the fertilizing columns, taking along fertilizer contained therein and further dripping into surrounding soil at a constant rate, so that the plant is effectively supplied with water and nutrients without waste of water. The water supply system optionally provides besides water water-soluble fertilizer, which flows into soil along with water.

Abstract: A watering and fertilizing device comprises at least one fertilizing column and a water supply system. The fertilizing columns are vertically inserted in soil, surrounding roots of a plant to be watered. Water from the water supply system enters the fertilizing columns, taking along fertilizer contained therein and further dripping into surrounding soil at a constant rate, so that the plant is effectively supplied with water and nutrients without waste of water. The water supply system optionally provides besides water water-soluble fertilizer, which flows into soil along with water.

Abstract: A combined aerobic and anaerobic treating method and facility for treating hog wastewater, in which, wastewater flows through six consecutive steps, namely: 1 raw wastewater tank 2 grit removal chamber 3 natural solid-liquid separation device 4 equalization basin 5 aeration tank and 6 final clarifier, and is effectively treated by way of microbiological technology, without adding any chemical precipitatant or coagulant, from highly polluted hog wastewater to qualified effluent for normal discharge. Not only can it help reduce river pollution, but also will be free from secondary pollution by adding chemical additives. An organic fertilizer, which can be directly utilized is a by product.