Evaluation Of Yield Potential Research Articles

Evaluation of yield potential and nutritional quality of various cultivars of barnyard millet (Echinochloa frumentacea L.) grown under subtropical India

Evaluation of yield potential and nutritional quality of various cultivars of barnyard millet (Echinochloa frumentacea L.) grown under subtropical India

Evaluation of yield potential and resistance to rhizoctonia (Rhizoctonia solani) disease of new sugar beet (Beta vulgaris L.) hybrids

Evaluation of yield potential and resistance to rhizoctonia (Rhizoctonia solani) disease of new sugar beet (Beta vulgaris L.) hybrids

Ex-Situ Conservation of Wild Edible Fruit Germplasm: A Practical Approach from Kerala

Efforts were made to conserve 570 accessions of wild edible fruit plants collected and conserved at JNTBGRI (Jawaharlal Nehru Tropical Botanic Garden and Research Institute) as part of the project entitled “Germplasm collection, evaluation of yield potential and exploitation of the fruit crops of the Western Ghats of Kerala”. The lesser- known wild plant accessions belongs to 106 species under 41 families. All the accessions are conserved ex-situ in JNTBGRI, Kerala, India. Among those 106 species, 67 species yield raw fruits, 11 species yield vegetable fruits, 22 species yield edible seeds / grains / kernels and the remaining 6 species yield spices and condiments. Twelve species are endemic to the Western Ghats region, of which, Salacia beddomei (Hippocrateaceae) comes in the red listed category and found mention in the Red Data Book of Indian Plants (Nayar & Sastry, 1988).

Evaluation of yield potential of indica rice cultivars in the subtropical and temperate ecological zones

Eight Chinese and Korean indica cultivars including Dianchao 1,Dianchao 3,Guichao 2,Dasanbyeo,Milyang 23,Samgang-byeo,Yongmoonbyeo and Nampungbyeo were employed to inverstigate the yield potential of indica rice cultivars in Binchuan county(subtropical zone) of Yunnan province in China and Suwon(temperate zone) in Korean from 2001 to 2002.The results showed that the average grain yield and yield potential of these cultivars in subtropical zone were over 1.25 t/hm2 and 4.43 t/hm2 respectively,which were more than those in temperate zone and were significantly existing 1% probable level.Spikelets and dry matter played an important role in the grain yield potential in different ecological zones.20000 spikelets per square meter and 422.25 g/m2 were more in subtropical zone than in temperate zone.The rank of yield factors for yield were the number of paniclespikelets per panicleseed setting rate1000-grain weight in subtropical zone while ranked as 1000-grain weightspikelets per paniclethe number of panicleseed setting rate in temperate zone.Therefore,the rice grain yield could be increased,by properly reducing grains of panicle and improving seed setting rate in subtropical zone and it is also most likely to improve spikelets per panicle and 1000-grain weight in temperate zone.

Evaluation of yield potential and stress adaptive trait in wheat genotypes under post anthesis drought stress conditions.

Twenty winter wheat genotypes were evaluated under both post-anthesis drought stress and normal conditions in Ardabil Agricultural Research Station in two successive growing seasons 2005 - 2007 using randomized complete block design with three replications. The results showed that there were significant differences between genotypes in stem reserve under both normal and post anthesis drought stress conditions. Post-anthesis drought stress did not affect kernel numbers per spike. The rate of dry matter accumulation by kernels considerably decreased by water deficit. Dry weight of vegetative organs decreased in grain filling period under stress and normal conditions, contrasting anthesis stage. But, the rate of translocated dry matter was much higher in genotypes nos. 14, 15, 16, 18, 19 and 20 under drought stress condition. 1000 GW and weight of kernels per spike were more severely reduced by water deficit. The positive correlation of grain yield with grain weight per spike, 1000 GW, remobilization of dry matter, harvest index and stress tolerance index (STI) and significant negative correlation of grain yield with drought susceptibility index (SSI) revealed that selection must be exercised for high harvest index, grain weight per spike, 1000 GW, remobilization of dry matter and STI in stress condition. The negative correlation of ‘STI’ with ‘SSI’ indicated the efficiency of ‘STI’ as a selection criterion for identifying the drought tolerant with high yield potential in winter wheat genotypes. Key words: Winter wheat, drought stress, dry matter, remobilization.

Simultaneous Selection for Yield and Resistance to Brown Stem Rot of Soybean in Hill Plots1

The yield of soybean [Glycine max (L.) Merr.] grown in row plots can be reduced by brown stem rot [caused by Phialophora gregata (Allington and Chamberlain) W. Gams]. Our objective was to evaluate the effectiveness of simultaneous selection among soybean lines for yield and resistance to brown stem rot in hill plots planted on soil infested with the causal organism. Ninety‐six random F4‐derived lines from an intermated population were grown in three replications of single, unbordered hill plots on four fields infested with P. gregata and on four uninfested fields. Selection for yield alone was not effective in identifying lines with a low percentage of stem browning. The correlation between yield and percentage of stem browning (r = −0.19) was not significant. Twenty‐three of the 48 lines with the highest average yield had below‐average resistance to brown stem rot. There was a high correlation for yield of the 96 lines on infested and uninfested soil (r = 0.80, P <0.01). When hill plots are used to determine the yield potential of soybean lines, resistance to brown stem rot should be evaluated independently by growing the lines on infested soil and splitting stems to determine the extent of infection. Evaluation of yield potential in hill plots can be done equally well on infested and uninfested soil.

F1 Evaluation of Yield Potential in Hexaploid Triticale1

Eight hexaploid triticale (X Triticosecale Wittmack) F1 populations were evaluated on the basis of yield in 1972 and 1973 at Winnipeg, Manitoba. In each year, one low‐, two intermediate‐, and one high‐yielding F1 populations were retained for F3 evaluation in an early‐generation yield trial. Comparisons were made of F1 and F3 yield rankings, also the number of high‐yielding F3 families produced by each F1 population. The results indicated that evaluation of crosses on the basis of F1 single plant yield was ineffective for the selection of crosses with a high yield potential in subsequent generations.

EFFETS DES METHODES DE SEMIS SUR L’EVALUATION DES CULTIVARS DE CEREALES

The differential response of a number of cultivars of wheat (Triticum aestivum L.), barley (Hordeum vulgare L.) and oats (Avena sativa L.) to different methods of seeding was studied. Results of eight station–years with wheat show significant differences in yield among the cultivars and among seeding methods. The highest rate of seeding of wheat, 118 kg/ha, resulted in a significant yield increase, but the yield increase was smaller with narrower rows. The interaction of methods of seeding × cultivars was not significant, indicating that the presently used testing procedures give adequate evaluation of yield potential of wheat cultivars. The stable cultivar performance at the various rates of seeding suggests that efficient individual plant selection could be made at lower rates of seeding in rows 15 cm apart. Results of eight station–years with barley and 12 station–years with oats show that the experimental testing procedures used are adequate to evaluate oats and barley cultivars for yield.