Phosphorus is a macronutrient that plays a number of important roles in plants. It is a component of nucleic acids, so it plays a vital role in plant reproduction, of which grain production is an important result. It is also critical in biological energy transfer processes that are vital for life and growth. Adequate phosphorus results in higher grain production, improved crop quality, greater ...

A feedback control method for regulating crop growth in advanced life support systems is presented. Two models for crop growth are considered, one developed by the agricultural industry and used by the Ames Research Center, and a mechanistic model, termed the Energy Cascade model. Proportional and pointwise-optimal control laws are applied to both models using wheat as the crop and light intens...

This paper provides a comprehensive review of literature related to the assessment of climate change impacts on crop productivity using climate, water and crop yield models. The existing studies present that climate change models with higher spatial resolution can be a way forward for future climate projections. Meanwhile, stochastic projections of more than one climate model are necessary for ...

assessment of agricultural drought risk at critical times before and during the growing season can provide sufficient time to policy makers and farmers to implement appropriate strategies to reduce the potential of risk. the purpose followed in the present study is to develop a statistical model to estimate the quality of agricultural drought risk for rainfed barley crop (prior to planting and ...

Mixture crops, as opposed to pure sowing crops, are characterised by more stable output, reduced expenditure on pesticides as well as smaller environment pollution thanks to the biological diversification of species. It seems mixture crops have good prospects while the pro-ecology movements are growing in popularity. The growth and development of plants, both in natural and formed ecosystems, a...

the main aim of this project was the assessment, for the first time, anthropometrically, the nutritional status in school girls' population aging from 7 to 10 years in ahwaz city and ultimately compare their growth rate with other findings obtained from different part of iran and also with the proposed standards of nchs in this respect. this study was conducted on 1200 apparently healthy school...

Nitrogen (N) is an essential macronutrient for plant growth and excessive application rates can decrease crop yield and increase N loss into the environment. Field experiments were carried out to understand the effects of N fertilizers on N utilization, crop yield and net income in wheat and maize rotation system of the North China Plain (NCP). Compared to farmers' N rate (FN), the yield of whe...

introduction castor plant, ricinus communis l. is a species of flowering plant in the spurge family; euphorbiaceae, which contains a vast number of plants mostly native to the tropics. it belongs to a monotypic genus ricinus. the name ricinus is a latin word for tick. the plant is probably named because its seed has markings and a dump at the end that resemble certain ticks (ncri, 2014). castor...

Much of cover crop research to date focuses on key indicators of impact without considering the implications over multiple years, in the absence of a systems-based approach. To evaluate the effect of three years of autumn cover crops on subsequent processing tomato (Solanum lycopersicum L.) production in 2010 and 2011, a field split-split-plot factorial design trial with effects of cover crop t...