Resultados de búsqueda - "Oryza sativa"

Chlorophyll meter- and leaf color chart-based nitrogen management for rice and wheat in northwestern India por Singh, Bijay, Singh, Yadvinder, Ladha, Jagdish K., Bronson, Kevin F., Balasubramanian, Vethaiya, Singh, Jagdeep, Khind, Charan S.

“…We used it to test need‐based N management approaches for rice (Oryza sativa L.) and wheat (Triticum aestivum L.) on a loamy sand in northwestern India. …”
Enlace del recurso

Influence of rhizobial inoculation on photosynthesis and grain yield of rice por Peng, Shaobing, Biswas, Jatish C., Ladha, Jagdish K., Gyaneshwar, Prasad, Chen, Yizhu

“…Rhizobial inoculation increases grain yield in rice (Oryza sativaL.), a nonlegume plant, but little is known about the mechanism(s) involved. …”
Enlace del recurso

Weed shoot morphology effects on competitiveness for light in direct-seeded rice por Caton, B.P., Mortimer, A.M., Foin, T.C., Hill, J.E., Gibson, K.D., Fischer, A.J.

“…The effects of weed shoot morphology on competitiveness for light in rice (Oryza sativa L.) have not been well described quantitatively and are difficult to study empirically. …”
Enlace del recurso

Performance of site-specific nutrient management for irrigated rice in Southeast China por Wang, Guanghuo, Dobermann, Achim, Witt, Christian, Sun, Quingzhu, Fu, Rongxing

“…Rice (Oryza sativa L.) yield increases in Zhejiang, China have slowed since 1985 despite the increasing use of hybrids and fertilizers. …”
Enlace del recurso

Use of chlorophyll meter sufficiency indices for nitrogen management of irrigated rice in Asia por Hussain, F., Bronson, K.F., Singh, Yadvinder, Singh, Bijay, Peng, S.

“…Low N fertilizer recovery efficiency (RE) remains a problem in rice (Oryza sativa L.) production in Asia. The chlorophyll meter has been shown to identify when rice is in need of a N top‐dressing, that if applied would result in greater agronomic efficiency (AE) of N fertilizer than commonly practiced, pre‐set timing schemes. …”
Enlace del recurso

Recycling of residual soil nitrogen in a lowland rice-sweet pepper cropping system por Shrestha, R.K., Ladha, J.K.

“…Residual mineral N after the dry season (DS) crop in an intensive rainfed lowland is lost upon flooding for rice (Oryza sativa L.) planting. The conservation and recycling of this N are essential for maintaining groundwater quality and system sustainability. …”
Enlace del recurso

Reversal of rice yield decline in a long-term continuous cropping experiment por Dobermann, Achim, Dawe, David, Roetter, Reimund P., Cassman, Kenneth G.

“…In a long‐term continuous cropping experiment at Los Baños, Philippines, three rice (Oryza sativa L.) crops were grown each year with the goals of maximum annual grain production and high N use efficiency. …”
Enlace del recurso

Grain yield of rice cultivars and lines developed in the Philippines since 1966 por Peng, S., Laza, R.C., Visperas, R.M., Sanico, A.L., Cassman, K.G., Khush, G.S.

“…Such information is limited in rice (Oryza sativa L.). The objective of this study was to determine the trend in the yield of rice cultivars–lines developed since 1966. …”
Enlace del recurso

Yield potential trends of tropical rice since the release of IR8 and the challenge of increasing rice yield potential por Peng, S., Cassman, K.G., Virmani, S.S., Sheehy, J.E., Khush, G.S.

“…Since the release of IR8 in 1966, 42 additional indica rice (Oryza sativa L.) cultivars developed by the International Rice Research Institute (IRRI) for the irrigated and favorable rainfed lowlands have been released in the Philippines. …”
Enlace del recurso

Nitrate in groundwater and integration of nitrogen-catch crop in rice-sweet pepper cropping system por Shrestha, R.K., Ladha, J.K.

“…In the intensive rice (Oryza sativa L.)‐based cropping systems of the tropics, dry season (DS) nonrice crop‐fallow (dry‐to‐wet [DTW] transition)‐wet season (WS) rice is a common practice. …”
Enlace del recurso

Estimation of canopy photosynthesis in rice by means of daily increases in leaf carbohydrate concentrations por Conocono, E.A., Egdane, J.A., Setter, T.L.

“…Our objective was to demonstrate that daily increases in nonstructural carbohydrates of shoots provide a good estimate of daily canopy photosynthesis for rice (Oryza sativa L.). Four cultivars— ‘IR72’, ‘IR64’, ‘IR50’, and ‘YRL39’— were grown in the field on a verlic tropaquept clay soil. …”
Enlace del recurso

Upper thresholds of nitrogen uptake rates and associated nitrogen fertilizer efficiencies in irrigated rice por Peng, Shaobing, Cassman, Kenneth G.

“…Measurements of the N uptake rate of rice (Oryza sativa L.) have usually been conducted over a period of 7 to 14 d. …”
Enlace del recurso

Nondestructive estimation of shoot nitrogen in different rice genotypes por Ladha, Jagdish K., Tirol-Padre, Agnes, Punzalan, Gloria C., Castillo, E., Singh, Upendra, Reddy, C. Kesava

“…A nondestructive method to determine shoot (aboveground biomass) N of transplanted rice (Oryza sativa L.) was developed based on SPAD‐502 chlorophyll meter readings, leaf area, and tiller number. …”
Enlace del recurso

Effect of growing rice on nitrogen mineralization in flooded soil por Kundu, D.K., Ladha, J.K.

“…This study was conducted to determine the effect of rice (Oryza sativa L.) on mineral N availability in a flooded Maahas soil (Typic Tropaquept). …”
Enlace del recurso

Genotypic variation in promotion of rice dinitrogen fixation as determined by nitrogen-15 dilution por Shrestha, R.K., Ladha, J.K.

“…Rice (Oryza sativa L.) genotypes capable of stimulating associative N2 fixation (NFS) are desirable to reduce dependence on fertilizer N. …”
Enlace del recurso

Tillage depth influence on soil nitrogen distribution and availability in a rice lowland por Kundu, D.K., Ladha, J.K., Lapitan-de Guzman, E.

“…Previous studies using artificial barriers at selected depths have shown the importance of N supply from soil below 15 cm to rice (Oryza sativa L.). Subsoil N availability and its use by wetland rice, however, have not been evaluated under normal field conditions. …”
Enlace del recurso

Crop Residue Effects on Nitrogen Mineralization, Microbial Biomass, and Rice Yield in Submerged Soils por Clément, A., Chalifour, F.-P., Ladha, J.K.

“…Urea, crop residues, and green manure are all suitable sources of N for lowland rice (Oryza sativa L.). However, N sources undergo mineralization at different rates, affecting rice N uptake and utilization. …”
Enlace del recurso

Possibility of Increasing Yield Potential of Rice By Reducing Panicle Height in the Canopy. I. Effects of Panicles on Light Interception and Canopy Photosynthesis por Setter, T.L., Conocono, EA, Egdane, JA, Kropff, M.J.

“…A new rice (Oryza sativa L.) plant type is proposed which is aimed at greater light interception by the leaves during grain filling and reduced susceptibility to lodging. …”
Enlace del recurso

Parameters Affecting Residue Nitrogen Mineralization in Flooded Soils por Becker, M., Ladha, J.K., Simpson, I.C., Ottow, J. C. G.

“…Seven legume species, three legume‐rice (Oryza sativa L.) straw combinations, rice straw alone, and an Azolla sp. were incorporated into two soils (an Andaqueptic Haplaquoll and a Tropofluvent) at 100 mg N kg−1 dry soil and incubated for 6 wk. …”
Enlace del recurso

Ultraviolet-B Radiation Effects on Growth and Physiology of Four Rice Cultivars por Dai, Qiujie, Coronel, Victoria P., Vergara, Benito S., Barnes, Paul W., Quintos, Arlene T.

“…This study was conducted to determine the effects of UV‐B on four high‐yielding, lowland rice (Oryza sativa L.) cultivars (IR30, IR45, IR64, and IR74), and to evaluate morphological and physiological parameters for identifying sensitive and less‐sensitive genotypes in future screenings. …”
Enlace del recurso