EFEITO DO NITROGÊNIO NO CULTIVO DE FEIJÃO IRRIGADO NO INVERNO

Foram conduzidos ensaios de campo, sob irrigação por aspersão, nos municípios de Ribeirão Preto, Votuporanga (1990, 1991) e Pindorama (1992, 1993), em 3 diferentes tipos de solo, no período de maio a agosto, visando estudar o efeito do nitrogênio, aplicado sob várias formas, no cultivar de feijão IAC-Carioca. O delineamento experimental utilizado foi o de blocos ao acaso, com 5 repetições. Os resultados mostraram que o nitrogênio fornecido à cultura de feijão no inverno, aumenta a produção. No solo de baixa fertilidade, a produção foi maior quando o N foi parcelado. A combinação do parcelamento de N no solo e via foliar foi superior à aplicação parcelada exclusivamente via foliar. As doses únicas aplicadas em cobertura foram mais efetivas do que aplicadas no plantio, sendo a melhor época de aplicação aos 25 dias após germinação.<br>An experiment was conducted at three localities, namely, Ribeirão Preto (Latosolic B Terra Roxa), Votuporanga (Dark red latossol sandy phase) and Pindorama (Podzolic Lins-Marília), in the State of São Paulo, Brazil. The objetive was to evaluate the response of nitrogen on irrigated dry beans during a two year period at Ribeirão Preto and Votuporanga (1990, 1991) and in Pindorama (1992, 1993). The experimental design was a complete randomized blocks design with five replications. The results showed that the yield of irrigated dry beans in the winter can be increased adding nitrogen. The sprint application is recommendable for the low fertility soil (Pindorama). The combination of N applied to the soil and on the leaves was more effective than that only on the leaves. The single dose applied at the 25th day after germination was more effective than the one aplied at the sowing date

Recent progress in x-ray spectral diagnostics of contrast dependent plasma at relativistic intensities of ~10^22 W/cm^2

At PW-class laser facilities pulse intensities of the order of 10^21 – 10^22 W/cm^2 can be reached by focusing high quality laser beams to spots of a few microns size. Under such conditions, during fs- time intervals a huge amount of optical energy is concentrated into a tiny volume and by the interaction with solid targets creates a plasma with high energy density. Such plasma can be sources of non-linear phenomena, among known and predicted by theory there is the acceleration to high energy of protons, ions, electrons and neutrons, generation of HOH and gamma-flare, creation of exotic states of hollow ions and WDM. The observed phenomena are defined by the type of target, laser energy and strongly depend on the prepulse condition. Achieving highly ionized states for elements with medium Z allows to effectively perform x-ray diagnostics of plasma parameters and preplasma conditions by means of high-resolution spectroscopy based on the analysis of spectra of H-like and He-like ions.Here we l present a review on the recent results on application of x-ray spectroscopic diagnostics of plasmas generated in the interaction of J-KAREN-P ultra-high intensity laser pulses with solid and clusters targets under conditions of different intrinsic laser contrast and under the cases of specially incorporated prepulse for controlled preplasma formation. Plasma parameters were evaluated by means of time integrated x-ray spectroscopic measurements and kinetic modeling using the code PrismSPECT. Certain line intensity relations, including the relations (Ly_a / He_b), (Ly_a / Ly_a satellites), relation between Ly_a satellites, as well as broadening and the shape of line, were used as the main tools for evaluation of plasma parameters. Each of the tools has preferred dependences on plasma electron temperature, electron density, electric and magnetic field strength. Four types of experiments are under consideration.3rd International Conference on Nuclear Photonics NP202