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1.
A field experiment was conducted during the winter seasons of 1992–93 and 1993–94 at Anand to study the effect of FYM, nitrogen and source of fertilizer on growth and yield of mustard [ Brassica juncea (L.) Czernj & Cosson]. The results showed significant variation in leaf area index (LAI), crop growth rate (CGR), dry matter production and seed yield. The direct effect of farmyard manure (FYM) was conspicuous in improving the growth of mustard. FYM application at 10 tonnes ha−1 significantly increased the LAI, CGR and dry matter accumulation per plant at almost all the stages during first year study (1992–93) and in pooled analysis. Similarly, nitrogen application registered maximum LAI, CGR at 75 kg level and RGR and NAR at 50 kg level at almost all the during both years. Sulphur carrying source (Ammonium sulphate plus single super phosphate) increased all stages growth characters. Maximum dry matter accumulation per plant and seed yield were recorded with highest levels of FYM (20 tonnes ha−1 ), N (75 kg ha−1 ) and source having S. Seed yield was strongly associated with LAI and dry matter accumulation per plant at all the stages. 相似文献
2.
Summary A 6×6 diallel was prepared to study the inheritance of leaf angle in T. aestivum L. Genetic analysis in terms of diallel cross parameters and graphic analysis indicated the control of additive gene effects in the expression of this character. The results of F1 analysis were supported by the analysis of F2 data. 相似文献
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4.
M. V. C. Gowda R. S. Bhat B. N. Motagi V. Sujay V. Kumari B. Sujatha 《Plant Breeding》2010,129(5):567-569
5.
M. Duru 《Journal of Agronomy and Crop Science》2008,194(5):401-412
For management purposes, models of lamina digestibility (DW) that are thermal time driven (Tsum) fail to account for plant nitrogen status (0 < Ni < 1) and defoliation intensity (residual sheath height: Sr). The objective of this paper was to enrich them using a functional processed-based model, which assumes that the decline in DW over time depends on the metabolic : structural tissue ratio and plant ageing. An experiment combining two N fertilizer rates and two defoliation regimes (differences in Sr) for two spring and two summer regrowth was done to analyse DW of laminae (youngest fully expanded) and tiller (whole green lamina) levels. For laminae, we show that both processes contribute to explain the decline in DW at a rate that depends on Ni but not on Sr. For tillers, consistent results were found justifying the use of a simple model: DW = f(+Ni; −Ni × Tsum; −Sr). Two different databases (from experiment and commercial farms) were used for validation: RMSD varied from 35 to 49 g kg−1. The process-based model strengthened the empirical model and improved the comprehensiveness of how management practices change DW. We used both models to create applications for reasoning yield in function of herbage mass in complement than in function of time. 相似文献
6.
Leaf rust (Puccinia recondita Rob. ex. Des.) is the most frequently occurring leaf disease in German winter rye (Secale cereale L.). To test the usefulness of race‐specific resistance genes, the effects of increased host diversity and complexity by producing two‐ and four‐line synthetics from inbred lines carrying different resistance genes were analysed. Thirty‐three synthetics along with two full‐sib families and one hybrid variety were tested in 17 environments in Germany under natural infections. For comparison, the parent lines of the synthetics were evaluated in 11 environments. Only two synthetics and the full‐sib families were resistant across all environments. Observed resistance levels of the synthetics were highly correlated (r = 0.83, P = 0.01) with those predicted from the parental values. Host complexity had a minor effect in two‐line synthetics only. In conclusion, the effectiveness of race‐specific leaf‐rust resistances among environments, and increasing the host complexity and diversity does not lead to a higher resistance level than that expected from the resistances of the parents. 相似文献
7.
Summary The expression of rust resistances conferred by closely linked genes derived from VPM1 varied with environmental conditions and with genetic backgrounds. Under low light and low temperature conditions seedlings carrying Yr17 showed susceptible responses. Stem rust and leaf rust resistance genes Sr38 and Lr37 tended to confer more resistance at 17±2° C than at normal temperatures above > 20° C. These studies supported the hypothesis that Yr17, Lr37 and Sr38 were derived from Aegilops ventricosa, whereas Pm4b was probably derived from T. persicum. Studies on certain addition lines and parental stocks indicated that wheat cytoplasm may enhance the expression of Sr38. 相似文献
8.
Lauriane Rouan Alain Audebert Delphine Luquet Sandrine Roques Audrey Dardou Eric Gozé 《Plant Production Science》2018,21(3):256-265
Air temperature is one of the most critical climatic factors controlling rice growth, development, and production in current and future climatic scenarii predicting increasingly frequent situations of extreme and/or fluctuating temperatures. With its large spectrum of geographical origins and cropping areas, one can credit tropical japonica rice subspecies of a probable genetic diversity of its response to air temperature, which is of major interest for the breeding of better adapted rice varieties. A panel of 195 rice accessions (175 japonica plus 20 reference cultivars) was studied in controlled environment to estimate cardinal (base, optimum, and maximum) temperatures based on the monitoring of the elongation rate (LERmax) of the sixth leaf on the main stem in response to six fixed thermal treatments ranging from 16 to 35 °C. A dedicated statistical framework was elaborated for estimating LERmax, cardinal temperature and related uncertainties. Developed statistical framework enhanced the precision of cardinal temperatures estimated compared to previously reported methods, especially for base temperature. Maximum temperature was trickier to estimate and will require further studies. A significant genotypic variability for base and optimal temperature was pointed out, suggesting tropical japonica subspecies represents a relevant genetic pool to breed for rice genotypes adapted to various thermal situations. These results also suggested that using genotype-dependent cardinal temperature values should enhance the way crop growth models account for genotype?×?environment interactions hence their predictive value in current and future climatic conditions. 相似文献
9.
10.
Mohammad Nazir Farrukh H. Shah 《Plant foods for human nutrition (Dordrecht, Netherlands)》1990,40(4):283-288
Freeze-dried leaf protein concentrate (LPC) contained 18% lipids in which linolenic acid (61.5%) was the major component. Linolenic acid in LPC was almost stable when stored at ambient temperature (30 to 35°C) and exposed to air for 24 weeks. Heating of LPC (50 to 200°C) in presence of moisture (6 to 12%) progressively increased the rate of destruction of linolenic acid. Below 100°C the presence of lipids did not affect the protein quality but at higher temperatures due to the lipid oxidation protein quality as estimated by dye-binding capacity was considerably affected. 相似文献