Field evaluation of slow-release nitrogen fertilizers and real-time nitrogen management tools to improve grain yield and nitrogen use efficiency of spring maize in Nepal

Gautam, Samikshya; Tiwari, Ujjal; Sapkota, Bibek; Sharma, Bala; Parajuli, Sapna; Pandit, Naba Raj; Gaihre, Yam Kanta; Dhakal, Krishna Hari

doi:10.1016/j.heliyon.2022.e09566

Cited by 7 publications

(4 citation statements)

References 38 publications

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“…UBN-150 increased PFPN by 8% and 21% and AEN by 22% and 27% over conventional urea applied at same rate (N-150) and the recommended N practice (N-200) (Figure 5). In accordance with this, previous studies have reported significant benefits of UB with deep placement in increasing NUE [13,38] and reducing N losses to the environment [6,20].…”

Section: Discussionsupporting

confidence: 83%

Optimum Rate and Deep Placement of Nitrogen Fertilizer Improves Nitrogen Use Efficiency and Tomato Yield in Nepal

Pandit¹,

Choudhary²,

Maharjan³

et al. 2022

Soil Systems

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In Nepal, blanket fertilizer recommendations without considering diverse soil types, nutrient status, climate and crop management practices along with imbalanced fertilization practices by farmers, mainly “urea fertilizer,” have resulted in reduced nitrogen use efficiency (NUE) and productivity in tomato production. Optimizing the rate of nitrogen (N) fertilizer, application time and improved application methods could increase crop yields and NUE and reduce environmental costs. This study was conducted to identify the optimum N rate and application method for increased tomato yield and NUE. Multilocation trials (n = 28) conducted in a randomized complete block design with nine treatments across five districts included the omission of N, P and K (N0, P0, K0), variable N rates of 100, 150, 200 and 250 kg ha−1 (N-100, N-150, N-200 and N-250), use of urea briquettes (UB) with deep placement (UBN-150) and a control (CK). N input in UB was reduced by 25% from the recommended N rate of 200 kg ha−1 considering its expected higher NUE. Yield responses from an NPK omission plot revealed N as the most limiting plant nutrient. Applications of fertilizer at N-100, N-150, N-200 and N-250 increased tomato yield by 27%, 35%, 43% and 27%, respectively, over N0. Tomato yields responded quadratically to the added N fertilizers with optimum rates ranging from 150 to 200 kg ha−1 across districts. UBN-150 significantly increased tomato yield by 12% over N-150 and produced a similar yield to N-200 (the recommended rate). The highest partial factor productivity of nitrogen (PFPN) was observed at N-100 and the highest agronomic efficiency of N (AEN) was at N-200. Deep placement of UB at-150 increased PFPN by 8% and 21% and AEN by 27% and 21% compared with N-150 and N-200, respectively. These results have positive implications for developing efficient N fertilization strategies to increase tomato yields and reduce environmental impacts in Nepal.

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Section: Discussionsupporting

confidence: 83%

Optimum Rate and Deep Placement of Nitrogen Fertilizer Improves Nitrogen Use Efficiency and Tomato Yield in Nepal

Pandit¹,

Choudhary²,

Maharjan³

et al. 2022

Soil Systems

Self Cite

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show abstract

“…In this study, it was observed that the application of Zn-coated slow-release urea significantly increased the fresh mass of wheat plants ( Table 4 ). This higher biomass production could be due to the more efficient uptake of N from the coated urea because the N is released slowly according to the plant's needs from the coated urea, which reduced the losses and increase the plant growth [ 76 , 77 ]. The increase in biomass due to higher N uptake is because most of the proportion of the assimilated N by plants is allocated to the photosynthetic apparatus, which results in increased photosynthetic activity and ultimately higher biomass production [ 78 , 79 ].…”

Section: Discussionmentioning

confidence: 99%

Reduction of nitrous oxide emission by using stearic acid combined zinc coated urea in silty clay and sandy loam soils under bare and planted conditions

Umar,

Balogh,

Hameed

et al. 2023

Heliyon

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“…Tofa et al [ 32 ] stated that increased N application resulted in increased grain yield of maize, which doubled under 60 kg N kg −1 and tripled under 120 kg N ha −1 compared to the control. Additionally, Gautam et al [ 33 ] reported maize grain yield treated with 180 kg N ha −1 doubled compared to untreated maize (3 tons ha −1 to –6 tons ha −1 ). The opposite trend was observed for Arjuna, Anoman, Srikandi Putih, Manding, Lokal Poso, NK 6172, Pertiwi 3, and NK 33, which showed a significant decrease in grain yield under N-high than that of N-sufficient by 5%–100%.…”

Section: Discussionmentioning

confidence: 99%

Characterization of yield and cumulative nitrous oxide emission of maize varieties in responses to different nitrogen application rates

Azizah

Purwanto

Tawaraya

et al. 2023

Heliyon

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Field evaluation of slow-release nitrogen fertilizers and real-time nitrogen management tools to improve grain yield and nitrogen use efficiency of spring maize in Nepal

Cited by 7 publications

References 38 publications

Optimum Rate and Deep Placement of Nitrogen Fertilizer Improves Nitrogen Use Efficiency and Tomato Yield in Nepal

Optimum Rate and Deep Placement of Nitrogen Fertilizer Improves Nitrogen Use Efficiency and Tomato Yield in Nepal

Reduction of nitrous oxide emission by using stearic acid combined zinc coated urea in silty clay and sandy loam soils under bare and planted conditions

Characterization of yield and cumulative nitrous oxide emission of maize varieties in responses to different nitrogen application rates

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