LY/T 3073-2018 Technical regulations for the management and conservation of old and notable trees

LY/T 1270 GB/T 8321.10-2018 Guideline for safety application of pesticides(Ⅹ) LY/T 1228-2015 Nitrogen determination methods of forest soils LY/T 1232-2015 Phosphorus determination methods of forest soils LY/T 1234-2015 Potassium determination methods of forest soils LY/T 2737-2016 Regulation for identification of old and notable trees LY/T 2738-2016 Technical regulation for surveying of old and notable trees LY/T 2970-2018 Technical regulation for monitoring growth and environment of ancient and notable trees HJ/T 166-2004 Soil environmental monitoring technical specifications LY/T 1228-1999 Determination of total nitrogen in forest soil LY/T 1232-1999 Determination of total phosphorus in forest soil LY/T 1234-1999 Determination of total potassium in forest soil LY/T 1237-1999 Determination of organic matter in forest soil and calculation of carbon-nitrogen ratio LY/T 1271-1999 Determination of total nitrogen,phosphorus,potassium,sodium,calcium,magnesium in forest plant and forest floor LY/T 1272-1999 Determination of total chlorine in forest plant and forest floor LY/T 1273-1999 Determination of total boron in forest plant and forest floor LY/T 1274-1999 Determination of total molybdenum in forest plant and forest floor LY/T 1253-1999 Determination of mineral total elements(silica,iron,aluminium,titanium,manganese,calcium,magnesium,phosphorus)ignition loss in forest soil GB/T 51168-2016 Technical code for routine maintenance and rejuvenation engineering of historic trees in the city