Abstract
Rice crops uptake large amounts of potassium (K), which is mainly supplied from inorganic fertilizer. Alternate K sources are essential to preserve natural reserves and to recycle unused K containing stubbles. We have evaluated the performance of rice straw (RS) in farmers’ field following integrated plant nutrient system (IPNS) for supplementing K requirement of rice and compared with agro-ecological zone (AEZ)-based chemical fertilizer and farmers’ practice in Tista Meander Floodplain soils of Bangladesh during 2013–2015. Application of RS @ 4.5 t ha−1 + IPNS-based fertilizer replaced full dose of chemical K fertilizer without significant reduction in grain yield of Boro rice. The K uptake with RS incorporation was similar to AEZ-based chemical fertilizer use. Considering soil health and environmental issue, RS + IPNS-based fertilizer management was the best option for growing wetland rice.
Highlights
Adequate rice (Oryza sativa L.) production is the key to ensure food security in Bangladesh (Kabir et al, 2015) because rice security is synonymous to food security in this country
We have evaluated the performance of rice straw (RS) in farmers’ field following integrated plant nutrient system (IPNS) for supplementing K requirement of rice and compared with agro-ecological zone (AEZ) -based chemical fertilizer and farmers’practice in Tista Meander Floodplain soils of Bangladesh during 2013–2015
Considering median values, grain yield in Boro season was 7.93 t ha−1 with RS + IPNS and 7.87 t ha−1 with AEZbased fertilizer management, which were greater than farmers’ practice (FP) (Figure 2(a))
Summary
Adequate rice (Oryza sativa L.) production is the key to ensure food security in Bangladesh (Kabir et al, 2015) because rice security is synonymous to food security in this country. Production of rice requires nitrogen (N), phosphorus (P), and potassium (K) as major nutrient elements These elements are important both in terms of the extent of their deficiencies in the soils, and their potential for crop yield increase or decrease (Kamrunnahar, Ahmad, Iqbal, Akter, & Islam, 2017). Rice straw production is plenty in Bangladesh, but its removal from the field resulting in loss of K and Si reserves (Dobermann & Fairhurst, 2002) This resource can be recycled because it is a rich source of K (1.6%), N (0.5%), P (0.08%), S (0.09%), and 0.01% Zn (Saha, Hossain, Naher, & Saleque, 2004) along with 0.40% calcium, 0.24% magnesium, and 6.30% silicon. This study was carried out in farmers’ fields with IPNS approach to assess the suitability of RS as an alternative to inorganic K fertilizer application for wetland rice production under rice–rice cropping system
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