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Tag Archives | rice

Root System Architecture & Nitrogen Management

Researchers questioned whether current improved rice varieties are suitable for organic agriculture. Through an experiment focused on nitrogen use efficiency (organic and inorganic sources) and root system architecture, they concluded that varieties bred for high-nitrogen inputs may not be suitable for organic agriculture — reinforcing the need for varieties to be bred specifically for organic agricultural systems. Here the researchers present their work:

The production and extensive application of N fertilizer to crops worldwide has contributed to major environmental problems due to soil leaching and greenhouse gas emissions that play a large role in ozone depletion. Sustainable agriculture aims to conserve natural resources with the mitigation of climate change, and there is increasing interest to move toward organic agriculture. An important issue regarding the acceptance of organic agriculture is the question of productivity. In addition to readily available ammonium and nitrate ions, the soil of organic agriculture can contain a wide range of organic nitrogen compounds such as peptides, proteins, free amino acids, amino sugars and nitrogen heterocyclic compounds. Continue Reading →

Silicon’s Role in Rice Production

rice-fieldSilicon (Si) is the second most abundant element of the Earth’s crust after oxygen. It has long been neglected by ecologists, as it is not considered an essential nutrient for plants. However, research in recent years shows that it is beneficial for the growth of many plants, including important crops such as rice, wheat and barley.

For instance, Si enhanced the resistance against pests, pathogens and abiotic stresses such as salts, drought and storms. Silicon might, thus, play a crucial role in the development of sustainable rice production systems with lower or zero input of harmful pesticides.

Researchers from the interdisciplinary LEGATO project on sustainable rice production looked in more detail at the cycle of plant-available Si in contrasting regions of Vietnam and the Philippines to provide insights on the importance of this element in rice production.

An article published in the journal Plant and Soil reports on Si cycling and budgets on the farm level in the Laguna province of the Philippines. The data shows that the irrigation water can provide a considerable amount of the Si that is taken up by plants. In rainwater, the concentrations of Si were below the detection limit of the analytical method; the researchers, thus, assume that rain is not an important Si source for plants. Another major source of plant-available Si is the dissolution of solid soil particles. Continue Reading →