Open AccessMonitoring fine root growth to identify optimal fertilization timing in a forest plantation: A case study in Northeast Vietnam
Author(s) -
Tran Van Do,
Nguyen Toan Thang,
Vu Tien Lam,
Dang Van Thuyet,
Phung Dinh Trung,
Tran Hoang Quy,
Nguyễn Thị Thu Phương,
Ly Thi Thanh Huyen,
Nguyễn Hữu Thịnh,
Nguyễn Văn Tuấn,
Dao Trung Duc,
Đặng Thị Hải Hà,
Duong Quang Trung,
Ho Trung Luong,
Nguyen Thi Hoai Anh,
Patrick Nykiel
Publication year - 2019
Publication title -
plos one
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.99
H-Index - 332
ISSN - 1932-6203
DOI - 10.1371/journal.pone.0225567
Subject(s) - human fertilization , fertilizer , wet season , growing season , agronomy , diameter at breast height , biomass (ecology) , biology , environmental science , dry season , productivity , crown (dentistry) , nutrient , botany , ecology , medicine , dentistry , economics , macroeconomics
Fertilizer is applied widely to improve the productivity of plantations. Traditionally, fertilization is conducted in spring and/or in the early rainy season, and it is believed to support the growth of planted trees in the growing season. Little attention to date has been paid on identification of the optimal timing of fertilization and fertilizer dose. In this study, application of the fine root monitoring technique in identifying optimal fertilization timing for an Acacia plantation in Vietnam is described. The study used two fertilizer doses (100 and 200 g NPK/tree) and three fertilization timings (in spring; in the early rainy season; and based on the fine root monitoring technique to identify when the fine roots reach their growth peak). As expected fertilization timings significantly affected growth and above-ground biomass (AGB) of the plantation. Fertilization based on the fine root monitoring technique resulted in the highest growths and AGB, followed by fertilization in the early rainy season and then in spring. Applying fertilizer at 200 g NPK/tree based on the fine root monitoring technique increased diameter at breast height (DBH) by 16%, stem height by 8%, crown diameter (D c ) by 16%, and AGB by 40% as compared to early rainy season fertilization. Increases of 32% DBH, 23% stem height, 44% D c , and 87% AGB were found in fertilization based on fine root monitoring technique compared to spring fertilization. This study concluded that forest growers should use the fine root monitoring technique to identify optimal fertilization timing for higher productivity.