[Effects of rhizosphere acidification on phosphorus efficiency in clones of poplar].
1
Citation
0
Reference
10
Related Paper
Citation Trend
Abstract:
Effects of rhizosphere acidification on P efficiency in different poplar clones were conducted by the method of soil culture in greenhouse. Potassium dihydrogen phosphate was applied to furnish 0, 40, 80, and 120 mg P2O5 kg-1. The experiment consisted of three replicates of each treatment, with a pot of 40 kg soil in a randomized block. The results showed that high P efficiency clones, such as S17, S19, and 105, could decrease their pH values in rhizosphere under P deficiency stress much stronger than clones 106, 797, I-69, 1388, and 3,244, which were low P efficiency clones. The most decrement of pH for the former even accounted to 1.32 pH units and the ratios of the decrements were over 10% in comparison with the pH values in bulk soil. Whereas for the latter less than 0.21 pH units and 2.5% of the decreasing ratio respectively. In contrast to low P efficiency clones, high P efficiency clones could acidify their rhizosphere through a kind of specific mechanism because the pH values in rhizosphere of high P efficiency clones were gradually decreased corresponding with the intensity of P deficiency stress and vice versa. The amounts of available P in rhizosphere of clone S17, S19, and 105 reached 2.64, 3.27, and 3.28 mg.kg-1, respectively, obviously higher than those of the other five low P efficiency clones, which all were below 2.00 mg.kg-1 under P deficiency stress, and the summation percentages of available P in rhizosphere were over 60% for all high P efficiency clones, but less than 10% for low P efficiency clones. The amounts of P taken up by high P efficiency clones were statistically greater than by low P efficiency clones. Regression analysis also indicated that the increment of available P in rhizosphere was closely correlated with the decrement of pH values in rhizosphere under P deficiency stress. This demonstrated the impact of rhizosphere acidification on availability of rhizosphere P, and identified that high P efficiency clones could enhance their contents of available P in rhizosphere, absorb more P and thus grow better through rhizosphere acidification depended on deficiency stress.Keywords:
Potassium phosphate
Cite
Effects of rhizosphere acidification on P efficiency in different poplar clones were conducted by the method of soil culture in greenhouse. Potassium dihydrogen phosphate was applied to furnish 0, 40, 80, and 120 mg P2O5 kg-1. The experiment consisted of three replicates of each treatment, with a pot of 40 kg soil in a randomized block. The results showed that high P efficiency clones, such as S17, S19, and 105, could decrease their pH values in rhizosphere under P deficiency stress much stronger than clones 106, 797, I-69, 1388, and 3,244, which were low P efficiency clones. The most decrement of pH for the former even accounted to 1.32 pH units and the ratios of the decrements were over 10% in comparison with the pH values in bulk soil. Whereas for the latter less than 0.21 pH units and 2.5% of the decreasing ratio respectively. In contrast to low P efficiency clones, high P efficiency clones could acidify their rhizosphere through a kind of specific mechanism because the pH values in rhizosphere of high P efficiency clones were gradually decreased corresponding with the intensity of P deficiency stress and vice versa. The amounts of available P in rhizosphere of clone S17, S19, and 105 reached 2.64, 3.27, and 3.28 mg.kg-1, respectively, obviously higher than those of the other five low P efficiency clones, which all were below 2.00 mg.kg-1 under P deficiency stress, and the summation percentages of available P in rhizosphere were over 60% for all high P efficiency clones, but less than 10% for low P efficiency clones. The amounts of P taken up by high P efficiency clones were statistically greater than by low P efficiency clones. Regression analysis also indicated that the increment of available P in rhizosphere was closely correlated with the decrement of pH values in rhizosphere under P deficiency stress. This demonstrated the impact of rhizosphere acidification on availability of rhizosphere P, and identified that high P efficiency clones could enhance their contents of available P in rhizosphere, absorb more P and thus grow better through rhizosphere acidification depended on deficiency stress.
Potassium phosphate
Cite
Citations (1)
Plants of Taraxacum sellandii Dahlst., a microspecies adapted to fertile, and Taraxacum nordstedtii Dahlst., adapted to infertile soils, were cultured hydroponically, either on a complete nutrient solution or on one deprived of nitrogen, phosphorus, or potassium ions. For all four treatments, the growth and internal mineral concentration of the plants was monitored. For plants cultured on a complete nutrient solution, the uptake rates of nitrate, phosphate, and potassium ions were determined. Luxury consumption of the three macronutrients was computed as the excess of ion absorption over the ion uptake rates minimally required to sustain maximum growth. In these calculations the critical N, P, or K + concentrations, earlier derived, were used as parameters describing the mineral status minimally required to allow maximum growth. Efficiency in use of the three macroelements at various levels of mineral accumulation was also computed. Finally, the response to phosphate starvation as related to phosphate uptake capacity and the accumulation of P was investigated. The physiological properies investigated provide a causal background for the superior adaptation of T. nordstedtii as compared to T. sellandii to infertile sites. Taraxacum nordstedtii had a higher relative luxury consumption of NO 3 – , H 2 PO ‐ 4 , and K + , a higher efficiency in N and P use at N– and (severe) P‐deficiency, respectively; and, after phosphate starvation, a relatively high preservation of phosphate uptake capacity and an enlargement of P storage. In combination with the low potential growth, luxury consumption will be particularly effective in T. nordstedtii in preventing or minimizing mineral deficiency. The distribution of minerals between cytoplasm and vacuoles as a factor in mineral use efficiency is discussed.
Inorganic ions
Cite
Citations (23)
Phosphorus (P) is one of the essential macronutrients needed for the plant growth, other than nitrogen and potassium. Most phosphorus remains as insoluble form in soils and the plants only can uptake the phosphorus nutrient in soluble forms. Phosphate solubilizing bacteria (PSB) dissolves the phosphorus and make it available for plants. In this study, Soil samples were collected and screened for PSB on PK medium. PSB colonies with the highest phosphate solubilization ability were chosen and used for studying its rhizosphere effect on Capsicum frutescens by pot experiment.. It was evidenced that selected PSB strain could solubilize phosphate in PK medium and modified PK broth. Besides, it provided available phosphorus for plants and enhanced the plant growth in pot experiment.
Phosphate solubilizing bacteria
Cite
Citations (1)
Potassium phosphate
Cite
Citations (0)
Potassium phosphate
Cite
Citations (1)
Dry weight
Potassium deficiency
Nitrogen deficiency
Phosphorus deficiency
Gram
Potassium phosphate
Cite
Citations (18)
Potassium-fortified inland saline water (K+ISW) has shown potential for growing marine species, including seaweed species. The response of a brown seaweed species, Sargassum podacanthum, to nitrogen and phosphorus enrichments were evaluated by culturing the species for 84 days in K+ISW and comparing it with Ocean Water (OW). The culture media were enriched weekly with ammonium chloride and sodium dihydrogen phosphate, with ammonium and phosphate ratios of 10:1 at five different concentrations 80:8, 120:12, 160:16, 200:20 and 240:24 µM. The culture medium with no enrichment was used as a control. The water quality and biomass of S. podacanthum were measured fortnightly. The S. podacanthum biomass increase significantly with different concentrations of the nutrient supplementations. The standing biomass and Specific Growth Rate (SGR) of S. podacanthum were similar in OW and K+ISW in the absence of any nutrient supplementation and at the supplement concentration of ammonium and phosphate 160:16 µM. However, from day 42 onwards, at the ratios of 80:8, 120:12, 200:20 and 240:24, S. podacanthum cultured in OW grew significantly faster than in K+ISW. In K+ISW, optimal growth of S. podacanthum was observed at the 160:16 and the increase in biomass was significantly higher than the initial biomass until day 70, whereas at the other four nutrient supplement concentrations, the S. podacanthum biomass remained unchanged during the entire culture period. The nitrite, total Kjeldahl nitrogen and phosphate concentrations in water were found to be significantly (p<0.05) and negatively correlated (p<0.05) with S. podacanthum biomass. Therefore, the results showed that the enrichment of 160 µM ammonium and 16 µM phosphate is required in the K+ISW for S. podacanthum to achieve optimal growth.
Sargassum
Saline water
Cite
Citations (1)
A 30- day feeding experiment was conducted to evaluate the efficacy of selected sources of inorganic phosphorus in a diet compounded for juvenile Penaeus indicus. The phosphorus sources tested were calcium phosphate dibasic, sodium phosphate
monobasic, potassium phosphate monobasic and a mixture of calcium phosphate dibasic and potassium phosphate monobasic in the ratio 1:1. Ihe efficacy ol the diets was evaluated in terms of weight gain, food conversion ratio (FCR), apparent feed
digestibility coefficient and apparent phosphorus digestibility. No significant differences were observed among the treatments (P>0.05) in the response parameters recorded.
However the best specific growth rate (4.05+ 0.32), apparent digestibility coefficient (ADC) of the diet (93.58± 2.05) and apparent digestibility of phosphorus (ADP) (55.08±2.05) were recorded for shrimps fed the diet supplemented with sodium
phosphate monobasic. but the best FCR (2.00 ± 0.33) was observed with the diet supplemented with a mixture of calcium phosphate dibasic and potassium phosphate monobasic in the ratio 1:1. The present study suggests that a diet containing good quality ingredients with sufficient available P (0.81 %) as in the control diet (diet-1) is adequate to promote survival, growth and phosphorus retention in juvenile P. indicus. However if a supplement source of P is required sodium phosphate monobasic is recommended in the diet as it provided the best response when incorporated in the diet in the tested salinity (17-19 ppt).
Monobasic acid
Potassium phosphate
Dibasic acid
Penaeus
Cite
Citations (0)
Effect of different sources of phosphorus, potassium, or calcium alone or in combinationson 'Manshiya' clone guava was studied during two successive seasons 1995 and 1996. Naphtalene Acetic Acid (NAA) applications either alone or in combination with the three mentioned minerals were also investigated. At harvest, the data indicated that CaC12 treatment did not result in a significant increase in fruit weight in both seasons. However, the combination of CaC12 plus each of potassium phosphate, calcium phosphate, or NAA caused a significant increase in fruit weight as compared with the control. Similarly, the combination of NAA plus either potassium phosphate, or calcium phosphate, or CaC12 led to a significant increase in fruit weight as compared with the control in both seasons. Fruit firmness at harvest was significantly increased by CaC12 alone or in combination with NAA during both seasons while calcium phosphate was not effective in increasingflesh firmness either alone or plus NAA or potassium phosphate when compared with the control. Moreover, NAA alone was not able to significantly affect fruit firmness at harvest in both seasons.Fruit abscission was significantly reduced by potassium phosphate plus either NAA or CaC12 when compared with NAA or CaC12 alone in both seasons. Calcium phosphate was significantly more effective than CaC12 in reducing fruit abscission in both seasons. Carotenes in the fruit skin at harvestwere not significantly increased by phosphorus sources such as potassium phosphate spray in both seasons as compared with the control. The addition of calcium phosphate to potassium phosphate did not result in a significant increase in carotene contents at harvest. After the shelf life period, NAA alone was not able to retard the loss of fruit firmness when compared with the control. However, the combination of NAA plus CaC12 caused a significant retardation in the loss of firmness in bothseasons. Calcium chloride in addition to either calcium phosphate or potassium phosphate resulted in higher fruit firmness after 7 days on the shelf as' compared with the control. It could be concluded that the combination of potassium phosphate plus NAA had positive effects on fruit quality and reduction of fruit abscission at harvest. Phosphorus sources, however, such as potassium phosphate were not effective in increasing carotenes at harvest even when combined with NAA or calcium phosphate
Abscission
Potassium phosphate
Cite
Citations (1)
Two separate experiments were carried out in a private farm in El-Matria; Dakahlia Governorate, Egypt during two successive seasons 2009/2010 and 2010/2011 to study the effect of potassium sources (potassium mono phosphate 52% K2O potassium sulphate 50% K2O and potassium citrate 38% k), levels (0, 60 and 120 kg K2O/ fed for each source), phosphorus sources (calcium super phosphate 15.5 % P2O5, rock phosphate 30 % P2O5 and phosphoric acid 85% P2O5) and levels (0, 30 and 60 kg P2O5/fed for each source) on vegetative growth, tuber yield and chemical constituents of potato (Solanum tuberosum L.) "Spunta".Treatments were arranged in randomized complete block design in three replicates.The obtained results indicated that both potassium mono phosphate at 120 kg K2O/fed and phosphoric acid at 60 kg P2O5/fed gave the highest values of vegetative growth parameters, tuber yield and its quality in both seasons as compared with other treatments and the differences were significant.
Phosphoric acid
Solanum tuberosum
Diammonium phosphate
Cite
Citations (0)