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Impact of manures and fertilizers on yield and soil properties in a rice-wheat cropping system

Alison Laing Akbar Hossain (2023, [Artículo])

The use of chemical fertilizers under a rice-wheat cropping system (RWCS) has led to the emergence of micronutrient deficiency and decreased crop productivity. Thus, the experiment was conducted with the aim that the use of organic amendments would sustain productivity and improve the soil nutrient status under RWCS. A three-year experiment was conducted with different organic manures i.e. no manure (M0), farmyard manure@15 t ha-1 (M1), poultry manure@6 t ha-1(M2), press mud@15 t ha-1(M3), rice straw compost@6 t ha-1(M4) along with different levels of the recommended dose of fertilizer (RDF) i.e. 0% (F1), 75% (F2 and 100% (F3 in a split-plot design with three replications and plot size of 6 m x 1.2 m. Laboratory-based analysis of different soil as well as plant parameters was done using standard methodologies. The use of manures considerably improved the crop yield, macronutrients viz. nitrogen, phosphorus, potassium and micronutrients such as zinc, iron, manganese and copper, uptake in both the crops because of nutrient release from decomposed organic matter. Additionally, the increase in fertilizer dose increased these parameters. The system productivity was maximum recorded under F3M1 (13,052 kg ha-1) and results were statistically identical with F3M2 and F3M3. The significant upsurge of macro and micro-nutrients in soil and its correlation with yield outcomes was also observed through the combined use of manures as well as fertilizers. This study concluded that the use of 100% RDF integrated with organic manures, particularly farmyard manure would be a beneficial resource for increased crop yield, soil nutrient status and system productivity in RWCS in different regions of India.

CIENCIAS AGROPECUARIAS Y BIOTECNOLOGÍA ORGANIC FERTILIZERS YIELDS SOIL PROPERTIES RICE WHEAT CROPPING SYSTEMS

CÓMO LLEVAR YUCATÁN A CUESTAS : LAS FOTOGRAFÍAS DEL ESTADO DE YUCATÁN EN LA EXPOSICIÓN HISTÓRICO-AMERICANA DE MADRID EN 1892

Marisol Domínguez González (2023, [Tesis de maestría])

“En el marco de las celebraciones del IV Centenario del llamado Descubrimiento de América, España organizó en Madrid la exposición Histórico-Americana de 1892, una muestra internacional que reunió a varios países, la mayoría antiguas colonias española, y con la que buscaba ostentar, entre otras cosas, su influencia en el desarrollo de estos territorios. Hacia la última década del siglo XIX los objetos fotográficos ya figuraban en las exposiciones universales fungiendo como una herramienta visual más para construir la imagen y/o la narrativa que un territorio, país o nación pretendía mostrar. Esta investigación explora la colección fotográfica que México presentó en la Exposición Histórico-Americana y se concentra específicamente en las fotos del estado de Yucatán. Con la intención de entender el papel de los conjuntos de fotografías en los procesos de construcción y exposición de un discurso local y nacional, aquí se indaga el qué y el cómo se mostró a México y a Yucatán a través de estas imágenes. Las fotos de Yucatán son series de diversa proveniencia, manufactura y temática que el gobierno estatal envió a la Junta Colombiana, instancia encargada de diseñar la propuesta expositiva de México. Estos objetos, que funcionaron como carta de presentación del estado de Yucatán en Madrid, se abordan dentro de la amplia colección fotográfica que México expuso. A su vez, para contextualizarla, se reconstruyen las salas de México y se revisa la propuesta expositiva y el proceso de participación del país dentro de la lógica general de la Exposición Histórico-Americana”.

Fotografías - Yucatán - Exposiciones. Yucatán - Historia - Exposiciones. Tesis - Maestría en Historia, Peninsular. CIENCIAS SOCIALES HISTORIA HISTORIA DE PAÍSES HISTORIA LOCAL HISTORIA LOCAL

Soil moisture content and maize grain yield under conventional and conservation agriculture practices - results of short term field tests in liselo, Namibia

Christian Thierfelder (2023, [Artículo])

This article focuses on the results from trials developed to monitor the short-term effects of conventionally tilled systems versus CA on soil quality and crop productivity under conditions of the major cropping systems in central, north-central and north-eastern regions of Namibia. Conventional tillage (CT), Minimum tillage (MT), Minimum tillage, mulch (MT-M), Minimum tillage, rotation (MT-R) and Minimum tillage, mulch and rotation (MT-MR) were the primary treatments tested. Significant differences (p≤0.000) among the treatments were observed in the 0-60 cm soil profiles where MT-M plots had the highest soil moisture content (39.8 mm, Standard Error of Mean 0.2815) over the study period. A significant difference (p=0.0206) in grain yield was observed in the second season with CT plots yielding the highest grain yield (3852.3 kg ha-1, standard error of mean 240.35). Results suggest that CA has the potential to increase water conservation and contribute to reduction of the risk of crop failure. Climate change driven degradation under conventional tillage necessitate alternative sustainable tillage methods. Conservation tillage methods and conservation agricultural practices that minimize soil disturbance while maintaining soil cover need to be adopted more locally as viable alternatives to conventional tillage.

Grain Yield Soil Moisture Content CIENCIAS AGROPECUARIAS Y BIOTECNOLOGÍA CONSERVATION AGRICULTURE CONVENTIONAL TILLAGE GRAIN YIELDS SOIL WATER CONTENT MAIZE