Open AccessThe Status and Fluctuation of Macronutrients of Nitrogen, Phosphorus and Potassium in Paddy Soils of Thai Binh Province
Author(s) -
Anh Thế Lưu
Publication year - 2017
Publication title -
tạp chí khoa học đại học quốc gia hà nội: nghiên cứu giáo dục (vnu journal of science: education research)/tạp chí khoa học đại học quốc gia hà nội: các khoa học trái đất và môi trường (vnu journal of science: earth and environmental sciences)
Language(s) - English
Resource type - Journals
eISSN - 2615-9279
pISSN - 2588-1094
DOI - 10.25073/2588-1094/vnuees.4116
Subject(s) - potassium , phosphorus , nutrient , soil water , nitrogen , chemistry , agronomy , limiting , zoology , environmental science , biology , soil science , organic chemistry , mechanical engineering , engineering
Macronutrients (N, P2O5, K2O) are needed during the growth stages of rice. The concentration of these nutrients of paddy soils is highly variable and dependent on farming systems and manuring regime. This research presents the status and fluctuation of macronutrients in the top soil layer (0 - 20 cm) of paddy soils in Thai Binh province for the period from 2005 to 2015 by analyzing data of 70 samples of the surface soil layer of Salic Fluvisols, Thionic Fluvisols and Fluvisols. The total and available contents of N, P2O5 and K2O were changed distinctively. There are some limiting factors such as lack of available phosphorus in the top soil layer of Fluvisols and lack of available potassium in all soil groups. Total content of N, P2O5 and K2O in all soil groups was not significantly increased. The available content of phosphorus increased rapidly in Salic Fluvisoils (increased by 3.51 mg/100g) and Thionic Fluvisols (increased by 5.16 mg/100 g), but decreased slightly in Fluvisols (reduced by 0.33 mg/100 g). Meanwhile, the available content of potassium was remarkly reduced in Fluvisols (reduced by 4.06 mg/100 g) but slightly decreased in all the remain soil groups. Available content of potassium in Salic and Thionic Fluvisols has a tendency to decrease slightly, i.e. 0.15 and 1.87 mg/100g, respectively. The study result provides the basis for a reasonable and balanced fertilization in rice paddy soils in Thai Binh province.