Los ministros de Agricultura y de Ciencia, Tecnología e Innovación –Luis Basterra y Roberto Salvarezza, respectivamente– junto con la presidenta del INTA –Susana Mirassou– presentaron el desarrollo científico. Se trata de nanoanticuerpos VHH derivados de llama y anticuerpos aviares IgY con la capacidad de neutralizar el SARS-CoV-2 que causa la enfermedad de coronavirus-2.
Trabajos en Prensa
Analysis of different crop sequences: contributions to the production system
The objectives of the study were: i) evaluate the production of biomass and yield of different crop sequences, four years in length (S1: wheat /2nd soybean -corn-soybean-wheat; S2: barley /2nd soybean -corn-soybeanwheat; S3: oat/2nd soybean -corn-sunflower-wheat and S4: canola/2nd soybean -corn-sorghum-wheat) under two technological manipulations: average level (NTM: used by the average farmer) and high level (NTA used by the tip farmer), ii) evaluate Nitrogen (N), phosphorus (P), sulfur (S) and potassium (K) extraction and N and P balance, for each complete sequence. The trials were conducted at the Experimental J. Hirschhorn (Los Hor-nos) dependent of Universidad Nacional de La Plata. The experimental design was in random blocks with four replicates and in divided plots. The Tukey test was used for the comparison of means (P<0.05). Total biomass tended to generate higher volume in S2, which resulted in a higher total grain yield in that sequence (32212 kg ha-1). The harvest date of the predecessor crop, such as the volume and/or quality of the stubble left, modified the successor’s response. The greater contribution of nutrients in the NTA caused total biomass and yields to be higher with a difference of 4715 and 1865 kg ha-1, respectively, increasing the nutrient extraction. The highest extractions of N occurred in S2 and S1, which in addition to their high yields, included soybean with the highest frequency, and in S4 with rape crop and S3. The highest phosphorus and sulfur extractions occurred at S4 followed by S2, S1 and S3. For the case of potassium the largest extractions were given in S2, followed
by S4, S1 and S3. The N and P balances were negative for all cases analyzed. The levels of technology used in this work, which are usually carried out by the farmer in the area, are not enough to satisfy the extractive capacity of the crops. Therefore it is difficult to expect to find zero balances in it.
Keywords: balance, nutrient extraction, rotations, yields, sustainability.
2CIC, Universidad Nacional de La Plata (UNLP).
3Curso Oleaginosas y Cultivos Regionales.
5Curso Cerealicultura. Facultad de Ciencias Agrarias y Forestales, Universidad Nacional de La Plata (UNLP), Calle 60 y 119, CC 31 La
Plata, Argentina. Correo electrónico: email@example.com