Maize Response to Fertilizer and Nitrogen Use Efficiency in Uganda

Kaizzi, Kayuki C.; Byalebeka, John; Semalulu, O.; Alou, Isaac Newton; Zimwanguyizza, Williams; Nansamba, Angella; Mazellier, Patrick; Ebanyat, Peter; Hyuha, Theodore; Wortmann, Charles S.

doi:10.2134/agronj2011.0181

Cited by 86 publications

(61 citation statements)

References 32 publications

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“…The mean UN with N 0 was 31.3 kg ha −1 compared with 46.3 kg ha −1 for maize under similar conditions (Kaizzi et al, 2012) (Table 5). Sorghum UN with N 0 is an estimate of the indigenous soil N supply and ranged from 13.4 to 54.1 kg ha −1 .…”

Section: Resultsmentioning

confidence: 91%

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Sorghum Response to Fertilizer and Nitrogen Use Efficiency in Uganda

et al. 2012

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Sorghum [Sorghum bicolor (L.) Moench] is important for smallholder production in semiarid parts of Uganda. Grain yields are low because of low soil fertility. Little fertilizer is used. Yield response to N, P, and K application, economically optimal rates for N, P, and K (EONR, EOPR, and EOKR, respectively), and N use efficiency (NUE) were evaluated at 11 site‐seasons. Mean sorghum yield with no N applied (N0) was 0.69 Mg ha−1 and was consistently increased by a mean of 230% with N application. Mean EONRs were 34 to 18 kg ha−1 N with fertilizer use cost to grain price ratios (CPs) of 10 to 30, respectively. Mean EOPRs were 11 to 2 kg ha−1 P with CPs of 10 to 50, respectively. Sorghum did not respond to K application. Net economic returns were greater for N than P application. Mean aboveground biomass N with 0 and 90 kg ha−1 N applied was 31.3 and 75.9 kg ha−1, respectively. Grain N concentration, N harvest index, and internal NUE at the EONR were 1.67%, 53.2%, and 31.8 kg kg−1, respectively, and higher than for N0. Mean recovery efficiency, partial factor productivity, and agronomic efficiency declined with increased N rate and were 135%, 79 kg kg−1, and 52 kg kg−1, respectively, at the EONR. The profit potential of fertilizer N use is high for smallholder sorghum production in Uganda. Policy interventions to reduce fertilizer cost and improve grain marketing efficiency will enable smallholders to increase fertilizer use for substantial increases in sorghum production.

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Section: Resultsmentioning

confidence: 91%

“…2). The mean EONR was less for sorghum than for maize ( Zea mays L.) produced under similar conditions (Kaizzi et al, 2012). Returns to applied N were more sensitive to the N rate as the CP increased.…”

Section: Resultsmentioning

confidence: 99%

Sorghum Response to Fertilizer and Nitrogen Use Efficiency in Uganda

et al. 2012

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“…The various assessments of NUEs are affected by the complex interaction of environment, management practices, and crop genotype (Ciampitti & Vyn, 2011) and are important to environmental sustainability and profitability. Low N application often results in poor yield, whereas excessive N application often reduces NUEs (Abbasi et al., 2012; Ciampitti & Vyn, 2011; Kaizzi et al., 2012). Both the suboptimal and supra‐optimal plant densities result in reduced yield and NUE (Yan et al., 2015).…”

Section: Discussionmentioning

confidence: 99%

Effects of fertilizer management strategies on maize yield and nitrogen use efficiencies under different densities

Wang

et al. 2020

Agronomy Journal

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Rational plant density and fertilizer management are important practices to improve maize (Zea mays L.) yield and nutrient use efficiency. Previous research indicated that plant density and fertilization had positive interaction on maize yield and N utilization. The research studied on the interactive effects of slow‐released fertilizer (added amino acid polymer biological preparation) and density on maize yield and nitrogen use efficiencies (NUEs). A 2‐yr field experiment with varieties Suyu29 (SY29) or Suyu30 (SY30) was conducted using a split‐split plot design. Three densities (6.0, 7.5, and 9.0 × 104 plants per ha) and three fertilization modes (0F‐no fertilizer, SF‐one‐time application of slow‐released fertilizer, and CF‐twice application of conventional fertilizer) were assigned. Results indicated that grain yields and NUEs of SF under 7.5 × 104 plants per ha were the highest both in SY29 and SY30. Compared with CF under 7.5 × 104 plants per ha, SF could improve pre‐ and post‐silking N uptake and promote N translocation from stalk and leaf into grain, which increased its contribution efficiency to grain N content and obtained higher NUE. The average N partial productivity, N agronomic efficiency, N recovery efficiency, and N absorption efficiency of SF were 5.3, 9.9, 20.1, and 11.4% higher than CF under 7.5 plants × 104 plants per ha. Increasing plant density, the grain yield, total N accumulation, and NUEs initially increased and then decreased both in SF and CF. These results suggest that one‐time application of SF combined with appropriate density could increase maize yield and NUE under our experiment condition.

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“…The calibration was carried out on the variety to improve model outputs by adjusting these coefficients to obtain a low RMSE and a high d-statistic. The model was validated using another maize dataset from Kaizzi et al (2012) conducted in Hoima district, Western Uganda.…”

Section: Model Calibration Using Seasonal Maize Yield Datamentioning

confidence: 99%

Using DSSAT-CENTURY Model to Simulate Soil Organic Carbon Dynamics Under a Low-Input Maize Cropping System

Mazellier¹,

Ebanyat²,

Tenywa³

et al. 2014

JAS

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Decline in Soil Organic Carbon (SOC) below the critical levels is one of the major indicators of soil fertility depletion in Sub-Saharan Africa (SSA), with the main causes being poor management practices coupled with low input use. Measures for monitoring long-term impacts of management on SOC dynamics and its restoration can be critical in enhancing sustainable soil productivity. Crop models have proved to be good tools for understanding the influence of management options on soil and crop productivity. The DSSAT-Century model was applied to simulate the influence of management practices on SOC dynamics. Using long-term datasets from Kabete, Kenya (1976-1996 and Kiboga-Uganda (1980, model calibration and evaluation showed a good fit between simulated and observed values of SOC. On simulating continuous tillage with no fertilization for the 1980-2010 antecedent period and 2010-2060 extrapolated period, the model showed high rates of SOC decline in the newly cultivated soil as compared to a degraded soil. The simulated rate of decline is 2129 kg ha -1 yr -1 for newly cultivated soil and 849 kg ha -1 yr -1 for the continuously cultivated soils. The model was sensitive to initial partitioning of SOC pools, with SOC in previously uncultivated soils declining at a higher rate than that in the cultivated ones. The model confirmed that use of continuous tillage is a major threat to SOC building and soil fertility restoration in the tropics. Adopting conservation agriculture is critical for future generations. Overall, the DSSAT CENTURY model is a potential tool for predicting SOC dynamics in low-input farming systems.

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Maize Response to Fertilizer and Nitrogen Use Efficiency in Uganda

Cited by 86 publications

References 32 publications

Sorghum Response to Fertilizer and Nitrogen Use Efficiency in Uganda

Sorghum Response to Fertilizer and Nitrogen Use Efficiency in Uganda

Effects of fertilizer management strategies on maize yield and nitrogen use efficiencies under different densities

Using DSSAT-CENTURY Model to Simulate Soil Organic Carbon Dynamics Under a Low-Input Maize Cropping System

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