scholarly journals Negative interactive effects between biochar and phosphorus fertilization on phosphorus availability and plant yield in saline sodic soil

2016 ◽  
Vol 568 ◽  
pp. 910-915 ◽  
Author(s):  
Gang Xu ◽  
You Zhang ◽  
Junna Sun ◽  
Hongbo Shao
Keyword(s):  
Phosphorus Availability ◽  
Interactive Effects ◽  
Phosphorus Fertilization ◽  
Sodic Soil ◽  
Plant Yield

scholarly journals Corrective and maintenance phosphorus fertilization on sugarcane yield in Oxisols

2021 ◽  
Vol 56 ◽  
Author(s):  
Thomaz Adolpho Rein ◽  
João de Deus Gomes dos Santos Junior ◽  
Djalma Martinhão Gomes de Sousa ◽  
Wellington Pereira de Carvalho ◽  
Gabriel de Castro Lemes
Keyword(s):  
Soil Phosphorus ◽  
Phosphorus Availability ◽  
Cane Yield ◽  
Phosphorus Fertilization ◽  
Saccharum Spp ◽  
High Phosphorus ◽  
Sugarcane Yield

Abstract The objective of this work was to evaluate sugarcane (Saccharum spp.) yield in response to corrective and maintenance phosphorus fertilization in Oxisols. Two experiments were carried out in randomized complete blocks with four replicates. In the corrective fertilization treatments, 150 kg ha-1 P2O5 were broadcast and incorporated before planting. In the maintenance fertilization treatments, 40 kg ha-1 P2O5 per year were applied over the trash blanket. All treatments, except the control, were fertilized with 170 kg ha-1 P2O5 in the planting furrow. The first experiment was carried out in a sugarcane expansion area and the second, in a replanting area, in Oxisols with a low and high phosphorus availability, respectively. In the first experiment, corrective fertilization increased cane yield in 13.4 Mg ha-1 for plant cane and in 14.6 Mg ha-1 for the average of four ratoon crops, whereas maintenance fertilization increased yield in 17.7 and 8.1 Mg ha-1 for the average of four ratoon crops for the treatments without and with corrective fertilization, respectively. In the second experiment, there were no significant differences between treatments regarding yield. Corrective and maintenance phosphorus fertilization should be considered for sugarcane in areas where soil phosphorus availability is limiting.

scholarly journals Interactive Effects of Light and Nitrogen on Pakchoi (Brassica chinensis L.) Growth and Soil Enzyme Activity in an Underground Environment

Agronomy ◽  
2020 ◽  
Vol 10 (11) ◽  
pp. 1772
Author(s):  
Songsong Li ◽  
Chao Liu ◽  
Xiao Tan ◽  
Bo Tan ◽  
Yuxin He ◽  
...  
Keyword(s):  
Enzyme Activity ◽  
Light Intensity ◽  
Nitrogen Addition ◽  
Soil Enzyme ◽  
Soil Enzyme Activity ◽  
Interactive Effects ◽  
Light Conditions ◽  
Nitrogen Application ◽  
Plant Yield ◽  
Plant Microbe Interaction

Light conditions and nitrogen fertilizer are crucial for plant growth, especially in the underground situations without sunlight and nitrogen deposition. In this paper, the effects of photoperiod (12 h and 16 h lighting time per day), light intensity (200, 300 and 400 μmol m−2 s−1) and nitrogen addition (0, 0.15, 0.3 and 0.45 g N kg−1 soil) on pakchoi growth and specific soil enzyme activity were investigated. The results demonstrated that there were strong interactive effects of light intensity and nitrogen addition on plant yield. The plant yield changed parabolically with increasing nitrogen addition when a light intensity was given between 200 and 300 μmol m−2 s−1, while the yield decreased linearly with increasing nitrogen application under the light intensity of 400 μmol m−2 s−1. The combination of 16 h photoperiod, 300 μmol m−2 s−1 light intensity and 0.3 g N kg−1 soil nitrogen addition was the best for pakchoi growth. The investigation of soil enzyme showed that the activity of urease responded negatively to nitrogen addition, whereas the activity of phosphatase had positive correlation with light intensity but was not affected by nitrogen addition. Our results suggested that the toxic effect of excessive nitrogen was a better explanation for the interactive effects of light and nitrogen than the plant-microbe interaction framework. The critical toxicity level of nitrogen for pakchoi was determined and showed negative correlation with light intensity.

scholarly journals Potential of Acid Phosphatase Activity and Mycorrhizal Colonization to Reduce Phosphorus Fertilization in Maize Cultivated in Brazil

2021 ◽  
Author(s):  
Lucas Lopes e Silva ◽  
Joao Antonio da Costa Andrade ◽  
Kátia Luciene Maltoni ◽  
Luciola S. Lannes
Keyword(s):  
Acid Phosphatase ◽  
Phosphatase Activity ◽  
Soil Phosphorus ◽  
Grain Filling ◽  
Phosphorus Availability ◽  
Organic Production ◽  
Mycorrhizal Colonization ◽  
Phosphorus Fertilization ◽  
Maize Production ◽  
Low Phosphorus

Abstract Purpose: It is urgent to mitigate the environmental impacts resulting from agriculture, especially in highly biodiverse and threatened areas, as the Brazilian Cerrado. We aim to investigate whether phosphatase activity and mycorrhizal colonization are alternative plant strategies for nutrient acquisition in maize cultivated under fertilized and unfertilized conditions in Brazil, potentially contributing to reduce the use of phosphate fertilizers needed for production.Methods: Three experiments were performed: the first was conducted in a glasshouse, with 17 experimental pure maize lineages and two phosphorus treatments; the second in the field, with 3 pure maize lineages and two treatments, one without fertilization and another with NPK fertilization; and the third was also carried out in the field, with 13 simple commercial hybrids, grown either under NK or under NPK treatment. Soil and plant variables were measured and tested for the response to fertilization, differences amongst genotypes and response to phosphatase activity and mycorrhizal colonization.Results: We detected a positive effect of mycorrhizal colonization upon growth in pure maize lineages. The activity of acid phosphatase was modulated by the availability of phosphorus and nitrogen in the soil, and promoted grain filling of commercial hybrids in soils with low phosphorus availability. Conclusions: These results demonstrate, for the first time, that it is possible to select genotypes that are more adapted to low soil phosphorus availability aiming at organic production, or to use genotypes that have high phosphatase activity under phosphorus fertilization to reduce the amount of added phosphorus needed for maize production in Brazil.

scholarly journals Ruzigrass affecting soil-phosphorus availability

2013 ◽  
Vol 48 (12) ◽  
pp. 1583-1588 ◽  
Author(s):  
Alexandre Merlin ◽  
Zhenli Li He ◽  
Ciro Antonio Rosolem
Keyword(s):  
Cover Crops ◽  
Cropping System ◽  
Phosphorus Availability ◽  
Phosphorus Fertilization ◽  
P Availability ◽  
P Fertilization ◽  
Rock Phosphates ◽  
P Fractionation ◽  
Soil P ◽  
Soil P Availability

The objective of this work was to evaluate the effectiveness of ruzigrass (Urochloaruziziensis) in enhancing soil-P availability in areas fertilized with soluble or reactive rock phosphates. The area had been cropped for five years under no-till, in a system involving soybean, triticale/black-oat, and pearl millet. Previously to the five-year cultivation period, corrective phosphorus fertilization was applied once on soil surface, at 0.0 and 80 kg ha-1 P2O5, as triple superphosphate or Arad rock phosphate. After this five-year period, plots received the same corrective P fertilization as before and ruzigrass was introduced to the cropping system in the stead of the other cover crops. Soil samples were taken (0-10 cm) after ruzigrass cultivation and subjected to soil-P fractionation. Soybean was grown thereafter without P application to seed furrow. Phosphorus availability in plots with ruzigrass was compared to the ones with spontaneous vegetation for two years. Ruzigrass cultivation increased inorganic (resin-extracted) and organic (NaHCO3) soil P, as well as P concentration in soybean leaves, regardless of the P source. However, soybean yield did not increase significantly due to ruzigrass introduction to the cropping system. Soil-P availability did not differ between soluble and reactive P sources. Ruzigrass increases soil-P availability, especially where corrective P fertilization is performed.

AVAILABILITY OF CU, ZN, AND MN AS INFLUENCED BY APPLICATION OF CU-POLYFLAVONOID

1974 ◽  
Vol 54 (2) ◽  
pp. 225-233 ◽  
Author(s):  
S. G. DOLAR ◽  
D. R. KEENEY
Keyword(s):  
Organic Matter ◽  
Avena Sativa ◽  
Plant Uptake ◽  
Interactive Effects ◽  
Available Phosphorus ◽  
Plant Yield ◽  
Surface Samples ◽  
Extractable Zn

Copper, in the form of Cu-polyflavonoid, was applied at 50 or 100 ppm to surface samples of nine Wisconsin soils varying from 0.8 to 12.5% organic matter. The effects on yield and on plant uptake of Cu, Zn and Mn were evaluated using oats (Avena sativa L. cv. Lodi). Complexed Cu additions increased extractable Cu, had little effect on extractable Zn, but also increased extractable Mn. Complexed Cu decreased plant uptake of Zn, but increased uptake of Mn. Interactive effects of organic matter, clay, available phosphorus and Zn appeared to occur with respect to plant yield and Cu, Zn, and Mn uptake.

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