Organic amendments for mitigating soil salinity in rice

Shithi Chowdhury,Md Abul Hashem,Dhiman Bhusan,Md Anamul Hoque

doi:10.3329/ralf.v6i1.41381

Shithi Chowdhury, Md Abul Hashem

Open Access

https://doi.org/10.3329/ralf.v6i1.41381

Copy DOI

Abstract

Salinity causes cellular damage and limits crop productivity. Accumulation of organic compound is one of the adaptive mechanisms to salinity in plants. The experiments were laid out in a randomized complete block design with three replications at the farmer’s field of Botiaghata, Khulna to investigate the mitigating effects of organic manures on salinity stress in rice genotypes during both aman and boro seasons. Two T. aman rice (salt-sensitive; BR-23 and local cultivar; Mohini) and two boro rice (salt-sensitive; BRRI dhan-29 and salt-tolerant; BINA dhan-8) were used as test crops. Farmyard manure (FYM) and poultry manure (PM) were applied to the soils during final land preparation. There were five treatments namely T0= control (no manure), T1=FYM (5 t/ha), T2=FYM (10 t/ha), T3=PM (4 t/ha), T4=PM (8 t/ha).Thirtyday- old rice seedlings were transplanted in the experimental plots. Salinity caused a significant reduction in growth and yield of both aman and boro rice. Under saline condition, BR-23 (aman rice) produced higher yield than local cultivar Mohini in aman season while BINA dhan-8 produced higher yield than BRRI dhan29 in boro season. Soil amendments with FYM and PM significantly increased the growth, and grain and straw yields of all rice cultivars under saline conditions. Increased nutrient uptake and K+/Na+ ratio in rice were also observed due to application of organic manures. No considerable changes in post-harvest soil properties such as pH, EC, CEC and organic matter status of saline soils were observed by addition of FYM and PM. The present study suggests that soil amendments with FYM and PM improve salt tolerance in rice by increasing K+/Na+ ratio and nutrient uptake. Res. Agric., Livest. Fish.6(1): 11-17, April 2019

Highlights

Soil salinity is a major concern to agriculture all over the world because it affects almost all plant functions
The present study suggests that soil amendments with Farmyard manure (FYM) and poultry manure (PM) improve salt tolerance in rice by increasing K+/Na+ ratio and nutrient uptake
It was observed that number of filled grains panicle[1] in all varieties was significantly increased due to organic amendments under salinity condition

Summary

Introduction

Soil salinity is a major concern to agriculture all over the world because it affects almost all plant functions. 7% of the world’s land area, 20% of the world’s cultivated land and nearly half of the irrigated land are affected by soil salinity (Zhu, 2001; FAO, 2008; Mali et al, 2012) In view of another projection, 2.1% of the global dry land agriculture is affected by salinity (FAO, 2008). The area under salinity is increasing with time (from 0.83 m ha to 1.056 m ha in 36 years; SRDI, 2010) due to rise in sea water level with increased global temperature. These coastal saline soils are distributed unevenly in 64 upazilas of 13 coastal districts covering portions of 8 agro-ecological zones of the country. The deficiency of K+ initially leads to chlorosis and causes necrosis (Gopal and Dube, 2003)

Methods

Results

Conclusion