Simulating nitrogen transport in paddy crop irrigated with alternate wetting and drying practice

Shekhar, Shashank; Mailapalli, Damodhara Rao; Raghuwanshi, N. S.

doi:10.1007/s10333-021-00850-x

Cited by 22 publications

(15 citation statements)

References 56 publications

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“…The other reason could be that the plant uptake and cationic NH 4 -N concentration generally bond with the anionic clay particles (9.1%) of the soil in the top layer, restricting the movement of the NH 4 -N ions to the lower layers/drainage. 48 However, in the CNT treatment, the NH 4 -N concentration in ponding water and leachate was the lowest compared to all fertilizer treatments, but the leachate concentration was 32% higher than that in the ponding water. The concentration of NH 4 -N in the CNT treatment may be due to irrigation water and mineralization of organic N from organic matter, crop residues present in the soil, and CEC of soil (Table 2).…”

Section: ■ Resultsmentioning

confidence: 82%

Engineered Urea-Doped Hydroxyapatite Nanomaterials as Nitrogen and Phosphorus Fertilizers for Rice

Pohshna

Mailapalli

2021

ACS Agric. Sci. Technol.

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The application of nanomaterials as nanofertilizers is one of the advanced solutions to overcome the excessive use of conventional fertilizers without compromising the yield. In this study, the synthesized urea-doped hydroxyapatite nanomaterials (UHN) at recommended (UHN_RD) and half-recommended (UHN_HRD) doses were compared with a recommended dose of commercial bulk urea fertilizer (BUF) and control (CNT) treatment for nutrient availability in soil and yield of rice crops. Rice was grown in 12 field columns (four treatments × three replications) by applying the fertilizer treatments at four growth stages and irrigating the columns conventionally. The crop growth parameters such as plant height, biomass, and yield were measured for all columns. The depths of ponding water and drainage were measured daily, and the water samples collected from ponding water and drainage were analyzed for ammonium (NH 4 -N), nitrate (NO 3 -N), and ortho phosphorus (PO 4 -P) concentrations. The grain yield was increased by 61, 60, and 65% in BUF, UHN_HRD, and UHN_RD, respectively, compared to the CNT treatment, which indicates that the UHN can result in a yield at par with commercial fertilizers. The concentrations of NH 4 -N, NO 3 -N, and PO 4 -P in the leachate were reduced by 69.11, 16.3, and 87%, respectively, under UHN_HRD and by 60, 10.6, and 66.3%, respectively, under UHN_RD compared to BUF. The nutrient use efficiency was the highest in UHN_HRD for nitrogen (76.5%) and phosphorus (14.27%) nutrients. The application of UHN as nitrogen and phosphorus sources revealed yield improvement and reduced leaching of nutrients. Therefore, UHN could be used both as a nitrogen and phosphorus supplement to rice crops at a reduced application rate.

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Section: ■ Resultsmentioning

confidence: 82%

Engineered Urea-Doped Hydroxyapatite Nanomaterials as Nitrogen and Phosphorus Fertilizers for Rice

Pohshna

Mailapalli

2021

ACS Agric. Sci. Technol.

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“…The average annual solar radiation and wind speed are 197.7 W/m 2 and 2.78 km/h, respectively. Based on the USDA soil textural classification (estimated by the pipette method), the topsoil (0–20 cm) of the study site is classified as sandy loam and the next two layers (20–50 cm and 50–90 cm) are classified as sandy clay loam. ,, The soils of the study site are grouped under alfisols…”

Section: Study Sitementioning

confidence: 99%

“…19 ), the topsoil (0−20 cm) of the study site is classified as sandy loam and the next two layers (20−50 cm and 50−90 cm) are classified as sandy clay loam. 7,8,20 The soils of the study site are grouped under alfisols. 21 2.1.…”

Section: Introductionmentioning

confidence: 99%

Effect of Alternate Wetting and Drying Irrigation Practice on Rice Crop Growth and Yield: A Lysimeter Study

Shekhar¹,

Mailapalli

Raghuwanshi

2022

ACS Agric. Sci. Technol.

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Alternate wetting and drying irrigation practice in rice cultivation can save a significant amount of irrigation water. It involves irrigating rice fields alternately based on an irrigation triggering criterion and possibly influences the soil–plant–water system. In this study, field experiments were carried out for 3 years with three levels of soil matric potential heads (SMPHs) (no soil water stress: conventional irrigation, NS; 400 cm: mild soil water stress, MS; and 750 cm: severe soil water stress, SS) along with three levels of nitrogen (150 kg N/ha: high nitrogen, HN; 120 kg N/ha: medium nitrogen, and MN; 60 kg N/ha: low nitrogen, LN), and they were replicated three times. The daily ponding water depth and SMPHs at 10, 40, and 70 cm soil depths and agronomical parameters (plant height, number of tillers, biomass, and grain yield) were measured at regular intervals during the field experiments. The field data were used to assess water and nutrient dynamics and determine the crop production function. The grain yield under MS was almost similar to that under NS, but it was reduced by 9% under the SS practice. On the other hand, the MS and SS practices reduced 23 and 27% of the total available water depth, 6 and 15% of N uptake, 5 and 15% of P uptake, and 7 and 18% of K uptake, respectively, compared to NS. Furthermore, the effect of lesser uptake of water and nutrients on the crop yield was not significant in the case of MS. The MS + MN practice reduces the irrigation water without any significant reduction in grain yield, and this combination of water and nutrient management will be more appropriate for sustainable rice production.

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“…These models can simulate the crop growth process very well, but the simulation of N transport and transformation is limited. In this regard, HYDRUS-1D has been applied extensively to simulate water, heat, and solute transport in various environments [27,28]. The sequential first-order decay chain is used to describe N transformation among urea, ammonia, and nitrate.…”

Section: Introductionmentioning

confidence: 99%

Modeling the Water and Nitrogen Management Practices in Paddy Fields with HYDRUS-1D

Chen

et al. 2022

Agriculture

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Rice production involves abundant water and fertilizer inputs and is prone to nitrogen (N) loss via surface runoff and leaching, resulting in agricultural diffuse pollution. Based on a two-season paddy field experiment in Jiangsu Province, China, field water and N dynamics and their balances were determined with the well-calibrated HYDRUS-1D model. Then, scenarios of different controlled drainage and N fertilizer applications were simulated using the HYDRUS-1D model to analyze the features and factors of N loss from paddy fields. Evapotranspiration and deep percolation were the two dominant losses of total water input over the two seasons, with an average loss of 50.9% and 38.8%, respectively. Additionally, gaseous loss of N from the whole soil column accounted for more than half of total N input on average, i.e., ammonia volatilization (17.5% on average for two seasons) and denitrification (39.7%), while the N uptake by rice accounted for 37.1% on average. The ratio of N loss via surface runoff to total N input exceeded 20% when the N fertilizer rate reached 300 kg ha−1. More and longer rainwater storage in rice fields under controlled drainage reduced surface runoff losses but increased the risk of groundwater contamination by N leaching. Therefore, compared with raising the maximum ponding rainwater depth for controlled drainage, optimizing N fertilizer inputs may be more beneficial for controlling agricultural diffuse pollution by reducing N loss via surface runoff and leaching. The HYDRUS-1D model provides an approach for the quantitative decision-making process of sustainable agricultural water and N management.

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Simulating nitrogen transport in paddy crop irrigated with alternate wetting and drying practice

Cited by 22 publications

References 56 publications

Engineered Urea-Doped Hydroxyapatite Nanomaterials as Nitrogen and Phosphorus Fertilizers for Rice

Engineered Urea-Doped Hydroxyapatite Nanomaterials as Nitrogen and Phosphorus Fertilizers for Rice

Effect of Alternate Wetting and Drying Irrigation Practice on Rice Crop Growth and Yield: A Lysimeter Study

Modeling the Water and Nitrogen Management Practices in Paddy Fields with HYDRUS-1D

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