Showing papers by "Man Singh published in 2018"
TL;DR: In this article, a field experiment consisting of eight treatments was designed in the sixth year of a continuing experiment under CA-based rice-mustard cropping system to estimate and analyse water budgeting in rice.
Abstract: Direct-seeded rice (Oryza sativa L.) (DSR) supported by conservation agriculture (CA)-based crop management practices is perceived to address the challenge of producing more rice grain with less water. DSR is endowed with multiple benefits/advantages over transplanted puddled rice (TPR) through savings in labour (40–45%), water (30–40%), fuel/energy (60–70%), and reductions in greenhouse gas emissions. It can be an economic alternative to TPR, but the performance of CA-based no-till and residue retained DSR has been hardly studied. Therefore, this field experiment consisting of eight treatments was designed in the sixth year of a continuing experiment under CA-based rice–mustard cropping system to estimate and analyse water budgeting in rice. Results revealed that, in the 0–15 cm soil layer, both DSR and TPR plots showed similar soil moisture content (SMC) values at initial, developmental, mid-season, and late-season periods. However, the overall SMC in a triple zero-till system that constituted mungbean residue (MBR) + zero-till DSR (ZT DSR) − rice residue (RR) + zero-till mustard (ZTM) − mustard residue (MR) + summer mungbean (SMB) treatment was 9.7 and 10% in soil surface, and in 15–30 cm soil layer, 32 and 12.6% higher than that in TPR − ZTM and TPR − CTM (conventional till mustard) treatments, respectively. Irrigation water requirment, including effective rainfall, was the highest during the mid-season (380.2 mm), followed by the initial stage (312.9 mm). The total amount of irrigation water applied to DSR plots was 924.3 mm against 1441.4 mm in TPR plots, indicating a 517 mm water saving. The amount of water used for puddling and ponding in TPR was 135 and 96 mm, respectively. The best treatment (MBR + ZTDSR − RR + ZTM-MR + SMB) showed a deep percolation of 5.8 mm day−1 that was 26% lower than the highest deep percolation (7.8 mm day−1) observed in TPR–CTM. Thus, a DSR crop under the triple zero-till system with retention of crop residues for three seasons can be recommended for attaining higher crop and water productivity. An extrapolation of these results revealed that, by adoption of this technology, 60060 Mm3 of water can be saved which can irrigate 6.72 Mha additional rice areas in the entire IGP (Indo-Gangetic Plains; total area under rice–wheat cropping system is 10.5 Mha). This may also lead to the mitigation of climate change effects. This practice can be adopted in the irrigated rice-growing belts of the North-western IGP of India and in similar agro-ecologies of the tropics and sub-tropics.
30 citations
19 Dec 2018
5 citations
TL;DR: In this article, the authors studied few soil physical indicators after the eighth cropping cycle of rice-wheat and found that organic sources of nutrients increased soil water retention (biofertilizer for rice), water conductivity and aggregate stability.
Abstract: We studied few soil physical indicators after eighth cropping cycle of rice-wheat The experiment was laid out in split-split plot design with two tillage (rice: puddling vs non-puddling; wheat: conventional tillage vs no-tillage), three water management (rice: submergence vs drainage; wheat: five/three/two irrigations) and nine nutrient (N) management treatments (inorganic vs integrated nutrient management) The bulk density (t m−3) in non-puddled soil (133) was significantly less than puddled soil (159); while mean weight diameter (055 mm) and saturated hydraulic conductivity (043 cm h−1) were higher in the former treatment Irrigation after 3-days of drainage was found to enhance soil aggregation (054 mm) and moisture retention (716%) during rice No-tillage in wheat had overall positive impact Organic sources of nutrients increased soil water retention (biofertilizer for rice), water conductivity and aggregate stability (combined organics for rice and wheat) Interactions between (t
3 citations
19 Dec 2018
TL;DR: In this article, an experimental investigation on assessing machining performance during EDM of Inconel 601 has been delineated, and an attempt has been made on evaluating optimal machining parameters setting to achieve satisfactory machining yield.
Abstract: Nickel-based super alloy (such as Inconel) is widely used in aerospace, nuclear, and chemical industries because of its excellent mechanical and chemical properties at elevated temperatures. Inconel comes under the category of "diffcult-to-cut" materials. In the present case, an experimental investigation on assessing machining performance during EDM of Inconel 601 has been delineated herein. Attempt has been made on evaluating optimal machining parameters setting to achieve satisfactory machining yield. A Box–Behnken design of response surface methodology has been adopted to es timate the effect of machining para meters on the response. Experiments have been carried out by varying gap voltage, peak current, pulse-on time (each varied at three discrete levels) to examine the extent of machining performance in terms of material removal rate using Brass and Graphite electrode.
3 citations