Temporal and Spatial Variation of Nutrient Fertility on Guangdong Litchi Plantation

Soil samples(208) were collected in Guangdong Litchi plantations to evaluate the soil nutrient fertility status by the criteria of National Second Soil Survey.Also,soil analysis result was compared with that of the soil nutrient fertility status in 2004 to reveal the Spatio-temporal variation.The result showed that soil nutrient fertility in Litchi plantation was low and in an imbalance.The status of soil nutrient fertility difference was great in different Litchi plantations.Magnesium was the most commonly deficient in Litchi plantation soil,and calcium took second place.Compared with 2004,soil fertility of Litchi plantation changed greatly,with an obvious decrease of available nitrogen,phosphorus,potassium,calcium,magnesium and zinc,as well as an increase of available sulphur and boron.Little variation of organic matter was detected.The Spatio-temporal variation was mainly contributed to the input amount of chemical fertilizer,commitment of secondary and micro element,and Litchi cultivation model as well.