131
© The Author(s) 2020
M. Gummert et al. (eds.), Sustainable Rice Straw Management,
https://doi.org/10.1007/978-3-030-32373-8_8
Chapter 8
Rice Straw Incorporation Influences
Nutrient Cycling and Soil Organic Matter
Pauline Chivenge, Francis Rubianes, Duong Van Chin, Tran Van Thach,
Vu Tien Khang, Ryan R. Romasanta, Nguyen Van Hung, and Mai Van Trinh
Abstract Rice straw incorporation is labor-intensive and influences greenhouse
gas emissions but can increase soil organic carbon (C) and recycle nutrients. Rice
straw contains about 80, 40, and 30% of the potassium (K), nitrogen (N), and phosphorus (P), respectively, taken up by rice and thus its incorporation can reduce the
fertilizer requirement of the subsequent crop. However, because of rice straw’s low
quality, its decomposition is slow. So, the timing of this operation, in combination
with water management, becomes important. Composting rice straw with the addition of farmyard manure can improve quality and nutrient supply. Similarly, biochar
from thermal combustion of rice straw for energy production can be added to the
soil to improve soil organic C. This chapter highlights the benefits derived from
incorporating straw into the soil. Alternative forms of straw that can be used by
farmers, depending on local situations, are discussed.
Keywords Soil organic carbon · Straw management · Nutrient supply ·
Micronutrients · Decomposition
P. Chivenge (*) · F. Rubianes · R. R. Romasanta · N. V. Hung
International Rice Research Institute (IRRI), Los Baños, Laguna, Philippines
e-mail: p.chivenge@irri.org; F.Rubianes@irri.org; r.romasanta@irri.org; hung.nguyen@irri.org
D. Van Chin
Dinh Thanh Agricultural Research Center, Loc Troi Group, Hoa Tan Hamlet,
Thoai Son District, An Giang, Vietnam
T. Van Thach
Dinh Thanh Agricultural Research Center (DTARC), Loc Troi Group, Hoa Tan Hamlet,
Thoai Son District, An Giang, Vietnam
V. T. Khang
Cuu Long Rice Research Institute, Can Tho City, Vietnam
M. Van Trinh
Institute of Agricultural Environment, Nam Tu Liem District, Hanoi, Vietnam
© The Author(s) 2020
M. Gummert et al. (eds.), Sustainable Rice Straw Management,
https://doi.org/10.1007/978-3-030-32373-8_8
Chapter 8
Rice Straw Incorporation Influences
Nutrient Cycling and Soil Organic Matter
Pauline Chivenge, Francis Rubianes, Duong Van Chin, Tran Van Thach,
Vu Tien Khang, Ryan R. Romasanta, Nguyen Van Hung, and Mai Van Trinh
Abstract Rice straw incorporation is labor-intensive and influences greenhouse
gas emissions but can increase soil organic carbon (C) and recycle nutrients. Rice
straw contains about 80, 40, and 30% of the potassium (K), nitrogen (N), and phosphorus (P), respectively, taken up by rice and thus its incorporation can reduce the
fertilizer requirement of the subsequent crop. However, because of rice straw’s low
quality, its decomposition is slow. So, the timing of this operation, in combination
with water management, becomes important. Composting rice straw with the addition of farmyard manure can improve quality and nutrient supply. Similarly, biochar
from thermal combustion of rice straw for energy production can be added to the
soil to improve soil organic C. This chapter highlights the benefits derived from
incorporating straw into the soil. Alternative forms of straw that can be used by
farmers, depending on local situations, are discussed.
Keywords Soil organic carbon · Straw management · Nutrient supply ·
Micronutrients · Decomposition
P. Chivenge (*) · F. Rubianes · R. R. Romasanta · N. V. Hung
International Rice Research Institute (IRRI), Los Baños, Laguna, Philippines
e-mail: p.chivenge@irri.org; F.Rubianes@irri.org; r.romasanta@irri.org; hung.nguyen@irri.org
D. Van Chin
Dinh Thanh Agricultural Research Center, Loc Troi Group, Hoa Tan Hamlet,
Thoai Son District, An Giang, Vietnam
T. Van Thach
Dinh Thanh Agricultural Research Center (DTARC), Loc Troi Group, Hoa Tan Hamlet,
Thoai Son District, An Giang, Vietnam
V. T. Khang
Cuu Long Rice Research Institute, Can Tho City, Vietnam
M. Van Trinh
Institute of Agricultural Environment, Nam Tu Liem District, Hanoi, Vietnam