Potassium requirements for growth and its related processes determined by plant analysis in wheat

Rao, N. Rama

doi:10.1007/bf02375001

Cited by 16 publications

(10 citation statements)

References 11 publications

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“…Some studies (Rao 1986;Nadia 2006) with crops have shown a dramatic increase in growth with increasing K addition, which has also been exhibited in these two cultivars in this study. However, different growth stages had different responses to K for both cultivars (Table 1).…”

Section: Effects Of Potassium On the Growth And Developmentsupporting

confidence: 63%

Differences in Growth and Potassium-Use Efficiency of Two Cotton Genotypes

Xia

Jiang

Chen

et al. 2011

Communications in Soil Science and Plant Analysis

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To study the differences in growth and potassium (K)-use efficiency of two different K-use-efficiency cotton genotypes, a pot experiment was conducted in 2007. Experimental materials include two cotton genotypes (HG103 and LG122) and two K application levels (0 and 0.23 g kg -1 soil). The initial dates of various growth stages, plant heights, numbers of leaves, squares, and bolls, and the amount of litter during the whole growing season were recorded. The distribution and accumulation of dry matter and K content in various organs were measured to compare the differences in K-use efficiency. Significant differences (P < 0.05) between the two genotypes and K levels were found in initial bolling time. At the reproductive growth stage, the plant heights and leaf number of HG103 were less than those of LG122. Greater numbers of squares and bolls were recorded from HG103 than LG122 with K application. Significant differences (P < 0.05) existed in dry matter and K contents in each organ in the two genotypes and K-application levels. The seed cotton yields of HG103 were 3.24 times larger than those of LG122 with K application and 1.77 times larger than those of LG122 with the marginal K treatments. Reproductive-to-vegetative ratios (RVR) and harvest indices (HI) of LG122 were less than those of HG103 whether K was applied or not. The ratios of K in reproductive organs to vegetative organs for LG122 were 0.47 and 0.51 with K application and the marginal treatments, respectively, and for HG103 were 0.66 and 0.75 respectively. The K accumulations in root, stem, and litter of LG122 were more than those of HG103, whereas those in leaves and bolls were less than those of HG103. These results indicated that HG103 transferred more photosynthesis products and K to cotton reproductive organs than LG122.

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Section: Effects Of Potassium On the Growth And Developmentsupporting

confidence: 63%

Differences in Growth and Potassium-Use Efficiency of Two Cotton Genotypes

Xia

Jiang

Chen

et al. 2011

Communications in Soil Science and Plant Analysis

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“…Leaf K + concentrations (Table 4) were within the sufficiency ranges presented by Rama Rao (1986). The small differences in K + concentration observed between nitrate-or ammonium-fed plants may be an indication of the low interference of the later ion in K + uptake when grown in sand.…”

Section: Potassium and Sodium Concentrationmentioning

confidence: 55%

Effect of NaCl salinity on photosynthesis, 14C-translocation, and yield in wheat plants irrigated with ammonium or nitrate solutions

Leidi

Lips

1990

Irrig Sci

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The effect of salinity (50 mM NaC1) on wheat photosynthesis, transpiration, growth and grain yield of plants growing in sand irrigated with nutrient solutions containing different nitrogen sources (NO~-or NH4 +) is described. At this salinity level, little yield decrease was observed although vegetative growth was affected to a larger extent. Salinity induced enhanced translocation of assimilates from the flag leaf to developing grains. No significant differences were observed between saltstressed plants irrigated with either ammonium or nitrate. The nitrogen source mainly affected kernel growth rate and final weight.The increased use of brackish water (3-8 dSim -1) for irrigation has resulted in a growing interest in the possible ways to increase yields under such limiting conditions. Some authors (Kafkafi 1984;Feigin 1985) have reviewed the effects of salinity on cation and anion uptake considering the antagonism phenomena in ion uptake mechanisms as the basis for reduction of depressive effects of salinity through enhanced fertilization. Others (Kingsbury et al. 1984;Rawson 1986; Schubert and Lfiuchli 1986;Robertson and Wainwright 1987) have studied the differential responses of genotypes to salinity, developing an alternative approach to overcome the decrease in yield caused by this type of stress.In the present report, we studied the effect of two nitrogen forms (NH~-and NO~-) and NaC1 (0 and 50 mM) on biomass and grain production, dry matter partitioning, photosynthetic activity and photosynthate translocation in wheat plants growing in dune sand. * Present address: UEI Fisiologia Vegetal, Estaci6n Experimental del Zaidin (CSIC), Aptdo. 419, E-18080 Granada, Spain Offprint requests to: E.O. Leidi Materials and methods Plant material and growth conditionsWheat (Triticum aestivum L. cv. Barkai) plants were germinated and grown in black polyethylene bags of sand irrigated with nutrient solutions in a greenhouse until maturity. Ten seeds per sand bag were sown of which 6 uniform plants were selected at the second leaf stage. Plants were maintained as a single tiller by cutting off secondary tillers throughout the entire life cycle, immediately upon their emergence. The polyethylene bags contained sand (10 kg) placed over a coarse gravel layer (3 kg) and 8-10 drainage openings (6 mm diameter) at the bottom. Maximum and minimum temperature averages during the growth period (November to April) were 18.5 and 7.0 ~ respectively. Nutrient solutions contained 4 mM nitrogen either as (NH4)zSO 4 or as Ca(NOa): . Additional components of the solution were: 3 mM K +, 1 mM HzPO a , 2 mM Ca z+, 1 mM Mg z+, and 1 mM or 4mM SO]-(NO~ or NH,~-based solutions respectively). Micronutrients were supplied at the concentration prescribed in the Long Ashton nutrient solution (Hewitt 1966) and iron as 40 mg Fe-EDDHA 1-1. These nutrient solutions (each containing nitrogen either as ammonium or nitrate) were combined with two salinity levels: 0 and 50 mM NaC1. Plants were irrigated with tap water until the second leaf stage at which ti...

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“…A reduction in leaf growth has been commonly reported for moderately K-deficient plants of wheat (Rama 1986), soybean (Itoh et al 1987) and cotton (Xi and Lihua 1989;Pettigrew and Meredith 1997;Reddy et al 2000;Zhao et al 2001). The relative decrease in leaf area has been mainly associated with a reduction in the rate of leaf elongation (JordanMeille and Pellerin 2004).…”

Section: Introductionmentioning

confidence: 92%

Effect of carbon assimilation on dry weight production and partitioning during vegetative growth

et al. 2009

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Potassium deficiency is known to deeply impact dry matter yield through a lower photoassimilates production. The objectives of this study were to find out and classify the principal mechanisms that accounted for the reduction in plant stature. Our approach used the framework of interceptionconversion modelling, with focuses on photosynthesis (gas exchange analysis, Farquhar model), plant-water relations (water potential components), and soluble sugars in leaves. Cotton plants were grown during 7 weeks under glasshouse hydroponic conditions and 4 increasing levels of potassium nutrition (K0, K1, K2 and K3). Sugar started to accumulate in mature leaves of K deficient plants at 20 days after emergence (DAE). This was mainly interpreted as the consequence of a low phloem loading for sucrose. At 40 DAE, leaf area and dry weight were reduced in K0 and K1 treatments compared to K2 and K3. Specific leaf weight was much higher in K deficient plants then in non deficient ones. Photosynthesis was reduced but only for severe deficient treatments (K0) and at the last measuring dates (50 DAE). We venture the hypothesis that sugar accumulation may be the key factor affecting nutrition of the growing organs, and photosynthetic capacity of the unfolded and mature leaves.

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Potassium requirements for growth and its related processes determined by plant analysis in wheat

Cited by 16 publications

References 11 publications

Differences in Growth and Potassium-Use Efficiency of Two Cotton Genotypes

Differences in Growth and Potassium-Use Efficiency of Two Cotton Genotypes

Effect of NaCl salinity on photosynthesis, 14C-translocation, and yield in wheat plants irrigated with ammonium or nitrate solutions

Effect of carbon assimilation on dry weight production and partitioning during vegetative growth

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