Evidence of nitrogen and potassium losses in soil columns cultivated with maize under salt stress
Claudivan Feitosa de Lacerda,Jorge F. S. Ferreira,Donald L. Suarez,Emanuel Dias Freitas,Xuan Liu,Aureliano de Albuquerque Ribeiro +5 more
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In this paper, the authors evaluated the accumulation of salts in the soil from irrigation water and of N and K from fertilization using a randomized block design in a 4 x 4 factorial, with four levels of salinity (0.5, 2.5 dS m-1), four N rates, and five replicates.Abstract:
The aim of this study was to evaluate the accumulation of salts in the soil from irrigation water and of N and K from fertilization. The experiment was conducted in PVC columns (20 cm in diameter and 100 cm in height), filled with non-saline soil, and cultivated with maize. A completely randomized block design in a 4 x 4 factorial was used, with four levels of salinity (0.5, 2.5, 5.0 and 7.5 dS m-1), four N rates, and five replicates. Nitrogen was applied as urea and potassium nitrate at the following rates: N1: N recommendation for maize (2.6 g column-1); N2: 0.3 times (0.78 g column-1) the recommended N1 dose; N3 and N4 with N based on N1 and N2 doses, respectively, reduced proportionally based on the evapotranspiration reduction caused by salinity. After 74 days from sowing, root and soil samples were collected at different soil depths. The electrical conductivity of the saturated extract (ECe) and the concentration of ions (Ca2+, Na+, and Cl-) increased as a function of salinity and soil depth. The opposite was observed for the root system. The increase in salinity also resulted in K+ and NO3- accumulation in the soil column, mainly in treatments with higher N rates (N1 and N3). At the end of the experiment, 88% of the NO3- applied at the highest salinity treatment (7.5 dS m-1) and the highest N rate (N1) was below 20 cm soil depth, evidencing a N loss process caused by leaching.read more
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Long-term combined effects of tillage and rice cultivation with phosphogypsum or farmyard manure on the concentration of salts, minerals, and heavy metals of saline-sodic paddy fields in Northeast China
Lihua Huang,Lihua Huang,Liu Ying,Andreas Kortenkamp,Jorge F. S. Ferreira,Mingming Wang,Jia Na,Jinxin Huang,Zhengwei Liang +8 more
TL;DR: Wang et al. as mentioned in this paper investigated the combined effects of annual tillage and rice cultivation with either phosphogypsum or farmyard manure on soil salinity, mineral status, and concentration of heavy metals in saline-sodic paddy fields.
Journal ArticleDOI
Long-term combined effects of tillage and rice cultivation with phosphogypsum or farmyard manure on the concentration of salts, minerals, and heavy metals of saline-sodic paddy fields in Northeast China
Lihua Huang,Andreas Kortenkamp +1 more
TL;DR: In this article , the combined effects of annual tillage and rice cultivation with either phosphogypsum or farmyard manure on soil salinity, mineral status, and concentration of heavy metals in saline-sodic paddy fields were investigated.
Journal ArticleDOI
Spinach Plants Favor the Absorption of K+ over Na+ Regardless of Salinity, and May Benefit from Na+ When K+ is Deficient in the Soil
TL;DR: It is suggested that spinach can be cultivated with recycled waters of moderate salinity, and less potassium than recommended, leading to savings on crop input and decreasing crop environmental footprint.
Journal ArticleDOI
Uses and losses of nitrogen by maize and cotton plants under salt stress
Aureliano de Albuquerque Ribeiro,Claudivan Feitosa de Lacerda,Antônia Leila Rocha Neves,Carlos Henrique Carvalho de Sousa,Regis dos Santos Braz,Adriana Cruz de Oliveira,Jordânia Maria Gabriel Pereira,Jorge F. S. Ferreira +7 more
TL;DR: In this article, the authors evaluated the uses and losses of N by cotton and maize plants growing under moderate to high salinity and found that nitrogen doses beyond the recommended values exacerbated the negative effects of salinity on growth and photosynthetic rates.
Book ChapterDOI
Strategies for the Use of Brackish Water for Crop Production in Northeastern Brazil
Claudivan Feitosa de Lacerda,Hans Raj Gheyi,José Francismar de Medeiros,Raimundo Nonato Távora Costa,Geocleber Gomes de Sousa,Geovani Soares de Lima +5 more
TL;DR: In this paper, the authors present an overview of water sources in Northeastern Brazil and several management strategies evaluated in this region, including: salt tolerant crops, soil and water management, appropriate cropping systems, application of mineral and organic amendments, and plant x microorganism interactions.
References
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Journal ArticleDOI
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