Agustín Pagani

• PhD
• CEO at Clarion, 9 de Julio, Buenos Aires, Argentina

The most widely used approach for prescribing fertilizer nitrogen (N) recommendations in maize (Zea Mays L.) in Argentina is based on the relationship between grain yield and the available N (kg N ha − 1), calculated as the sum of pre-plant soil NO 3-N at 0− 60 cm depth (PPNT) plus fertilizer N (N f). However, combining covariates related to crop N...

Nitrogen (N) and sulfur (S) critical dilution curves and the N:S stoichiometry are useful tools for evaluating nutrient status in maize (Zea mays L.). Nutrient supply for both N and S impact plant nutrient uptake, consequently influencing the overall performance of fertilization diagnostic tools. Interaction between these nutrients has not been stu...

Nitrogen (N) and sulfur (S) deficiencies, individually and in combination, produce gaps between actual and potential yields in maize (Zea mays L.). Our objectives were to evaluate the effect of N and S status and their interaction on yield gap, and nutrient use efficiency (yield per unit of nutrient supply) using frameworks of co-limitation and sto...

Core Ideas Critical S dilution curve was established for maize: S concentration = 2.13 × biomass−0.23. The S nutrition index successfully diagnosed S status at early crop stages (∼V6). Sulfur concentration and chlorophyll meter reading, both in the upper leaf, were good predictors of the S nutrition index. Sulfur (S) deficiency can severely limit...

Site-specific nitrogen (N) management can contribute to maximize N use efficiency, increase production profits, and reduce environmental impacts. However, a lack of site-specific N recommendations has leaded to a low adoption of variable rate N (VRN) in Argentina. The objectives of this research were to: a) determine the economic optimum nitrogen r...

It is known that soil acidity can limit crop yield, but additional research is needed to identify more precisely optimum soil pH for corn (Zea mays L.) and soybean [Glycine max (L.) Merr.] and the within-field variation in yield response to liming. The objective of this study was to identify optimum soil pH for these crops by studying the variation...

Sulfur (S)-diagnostic tools are essential for rational use of S fertilizers. There is little information about the suitability of leaf greenness intensity to detect S deficiency in corn (Zea mays L.). This work evaluates, under controlled S-stressed conditions, (1) the performance of leaf greenness intensity as an indicator of the degree of S defic...

Nitrogen (N) and sulfur (S) are crucial nutrients in maize production. However, N and S application effects on accumulation and partitioning of both nutrients are not well documented for variable-yielding maize. The objective of this work was to evaluate the effect of N and S fertilization on grain yield, dry mater (DM), N, and S accumulation and h...

Uncertainty exists concerning soil pH change and crop yield after applying different lime sources and rates. The objective of this study was to evaluate effects of different lime sources on soil pH and crop responses. Four trials were established on Iowa soils with pH 5.39 to 5.71. Pure CaCO3 and calcitic (2.3 g kg−1 Mg) or dolomitic (80.7 g kg−1 M...

Little field research has evaluated the effectiveness of pH buff er methods free of hazardous chemicals, such as Sikora and Mehlich methods, for estimating lime requirement (LR). Th is study assessed how Shoemaker–McLean–Pratt (SMP), Sikora, and Mehlich buffers, titratable acidity (TA), and soil properties relate to the LR under on-farm conditions....

Sulfur availability indicators are necessary for rational use of S fertilizers. There are disagreements, however, about which S diagnostic method provides the best results for many crops. This work evaluates the performance of different S diagnostic methods for corn (Zea mays L.). Five field experiments with different rates of S and sufficiency of...

The objectives of this work were to (1) asses how Shoemaker-McLean-Pratt (SMP), Sikora, and Mehlich buffers, titratable acidity, and soil properties relate to soil pH change due to liming, (2) study the variation of soil pH and crop response to lime within fields, (2) identify optimum soil pH for corn and soybean, (3) evaluate the effect of subsoil...

Several methodologies measure leaf greenness intensity and relate it to crop N status. There is no evidence, however, of the utility of this variable to detect N deficiencies in corn (Zea mays L.) under S deficiency. The objective of this work was to evaluate the potential of two indexes based on leaf greenness intensity to detect N deficiencies in...

Nitrogen (N) and sulfur (S) are very important nutrients in corn production in the Pampas Region. However, there is not enough bibliographic evidence related to N and S effects and their interaction on grain yield response, N and S fertilizer use efficiency (EUFN and EUFS) and the economic benefit of fertilizing with N and S. The objective of this...

Nitrogen (N) and sulfur (S) are very important nutrients in corn production in the Pampas Region. However, there is not enough bibliographic evidence related to N and S effects and their interaction on grain yield response, N and S fertilizer use efficiency (EUFN and EUFS) and the economic benefit of fertilizing with N and S. The objective of this...

Nitrogen fertilization in corn under no-till is a common practice in SE Buenos Aires Province; however, there is insufficient local information to define the nitrogen (N) rate that corresponds to the maximum economic benefit. The aim of this work was to optimize the economic nitrogen rate (DOE) for corn under no-tillage using an improved mathematic...

Nitrogen fertilization in corn under no-till is a common practice in SE Buenos Aires Province; however, there is insufficient local information to define the nitrogen (N) rate that corresponds to the maximum economic benefit. The aim of this work was to optimize the economic nitrogen rate (DOE) for corn under no-tillage using an improved mathematic...