scholarly journals INFLUENCE OF NITROGEN, POTASSIUM, AND MAGNESIUM FERTILIZATION ON DAY-NEUTRAL STRAWBERRIES IN QUEBEC

HortScience ◽  
1994 ◽  
Vol 29 (4) ◽  
pp. 251d-251
Author(s):  
M. Lamarre ◽  
M.J. Lareau
Keyword(s):  
Significant Influence ◽  
Fruit Size ◽  
N Fertilization ◽  
Trickle Irrigation ◽  
Fertilization Rates ◽  
Strawberry Cultivar ◽  
K Fertilization

From June to Sept. 1993, the day-neutral strawberry cultivar Tribute was subjected to two N fertilization rates (50 and 100 kg/ha), four K fertilization rates (0, 60, 120, and 180 kg/ha), and three Mg fertilization rates (0, 25, and 50 kg/ha) through trickle irrigation. The N and K treatments had no significant influence on yield and fruit size. The Mg treatments increased fruit size and did not affect yield.

scholarly journals The Fertilization of Day-neutral Strawberries in Quebec

HortScience ◽  
1995 ◽  
Vol 30 (4) ◽  
pp. 880E-880
Author(s):  
M. Lamarre ◽  
M.J. Lareau
Keyword(s):  
Significant Influence ◽  
Fruit Size ◽  
Trickle Irrigation ◽  
Fertilization Rates ◽  
Strawberry Cultivar ◽  
Second Year

During 1993 and 1994, the day-neutral strawberry cultivar Tribute was subjected to two rates of N (50 and 100 kg–ha–1), four rates of K (0, 60,120, and 180 kg–ha–1), and three rates of Mg fertilization (0, 25, and 50 kg–ha–1) from June to September through trickle irrigation. The objective of this experiment was to determine the best N, K, and Mg fertilization rates in the production of day-neutral `Tribute' strawberry. The N treatments had no significant influence on yield and fruit size for the two years. We observed the same situation for K as for N. For Mg treatments, fruit size was increased by adding 25 kg–ha–1 during the first picking in 1993, and they had no effect in the second year. For both years, the Mg had no effect on the yield.

scholarly journals Long-term annual fertilization with nitrogen and potassium affect yield and mineral composition of 'Fuji' apple

2009 ◽  
Vol 66 (3) ◽  
pp. 377-385 ◽  
Author(s):  
Gilberto Nava ◽  
Antonio Roque Dechen
Keyword(s):  
Mineral Composition ◽  
Fruit Size ◽  
N Fertilization ◽  
K Fertilizer ◽  
Fuji Apple ◽  
The Mean ◽  
K Concentration ◽  
Fertilizer Rates ◽  
K Fertilization

Nitrogen (N) and potassium (K) are closely related to orchard productivity, since they are usually found in higher concentrations than others macronutrients in apple (Malus × domestica Borkh) fruits. This research was carried out to assess the effect of eight years of soil additions of N and K on yield, fruit size and mineral composition of 'Fuji'/Marubakaido apple in São Joaquim, State of Santa Catarina, Southern Brazil. A factorial design was used with N and K annual fertilizer rates (0, 50, 100, 200 kg ha-1 of N and K2O) replicated in three orchards from 1998 to 2006. Yield was estimated by multiplying the total number of fruit per tree by the mean weight of 100 randomly sampled fruit. Fifteen days prior to harvest, 24 fruit pulps were analyzed for N, K, Ca and Mg contents. Increases in yields were noticed in five and four years, due to the N and K fertilizer additions, respectively. Fruit size was more affected by K than by N fertilization. Fruit mineral composition was affected by both N and K fertilization. N concentration and N:Ca ratios were enlarged by N fertilization. K concentration and K:Ca ratios were also enlarged by K fertilization. Ca fruit concentration was reduced by N fertilization and often by K. Ca-related fruit disorders were not observed even after 180 days storage. However, N and K fertilization affected Ca nutrition. Thus, when fertilizing with N and K, it is imperative to use combined practices in order to offset the detrimental effect that these nutrients may cause on Ca concentration in the fruit.

scholarly journals Responses of Cynanchum taiwanianum and Its Bioactive Compound Biosynthesis to Levels of Nitrogen and Potassium Fertilization

Agronomy ◽  
2022 ◽  
Vol 12 (1) ◽  
pp. 180
Author(s):  
Han-Mei Tseng ◽  
Tzy-Ming Lu ◽  
Lean-Teik Ng
Keyword(s):  
Field Experiments ◽  
Bioactive Compound ◽  
N Fertilization ◽  
Total Phenolic ◽  
Essential Information ◽  
Fertilization Rates ◽  
Potassium Fertilization ◽  
Lack Of Information ◽  
Increasing Demand ◽  
K Fertilization

Cynanchum taiwanianum is an important plant used in traditional medicine. The increasing demand and lack of information regarding its cultivation have become concerns for sustainability. This study examined the effects of nitrogen and potassium fertilization rates on the growth and biosynthesis of main bioactive compounds, including cynandione A and polyphenolic compounds, in field-cultivated C. taiwanianum. Two field experiments were conducted using three levels of nitrogen (N100, N150 and N200) and three levels of potassium (K100, K150 and K200) treatments. The experimental variables were either N or K fertilizer. The results showed that, aside from N200, N and K fertilization significantly increased C. taiwanianum shoot and tuber biomass. High N fertilization resulted in low total phenolic and total flavonoid contents in shoots and tubers, but the effects of K fertilization were minimal. Cynandione A, an important bioactive compound, was only detected in tubers; its content were enhanced with the increasing K fertilization, but reduced with excess N fertilization (N200). Although N and K fertilizers are important for C. taiwanianum tuber production, the yield of cynandione A was associated with K but not N fertilization rates. These results provide some essential information for the optimal production of C. taiwanianum tubers and functional compounds. Further studies are required to examine the mechanism(s) of cynandione A biosynthesis and its compartmentation in plant tissues.

Calculating socially optimal nitrogen (N) fertilization rates for sustainable N management in China

2019 ◽  
Vol 688 ◽  
pp. 1162-1171 ◽  
Author(s):  
Yulong Yin ◽  
Hao Ying ◽  
Yanfang Xue ◽  
Huifang Zheng ◽  
Qingsong Zhang ◽  
...  
Keyword(s):  
N Fertilization ◽  
Fertilization Rates ◽  
N Management

scholarly journals Shelf-Life of Bunched Carrots as Affected by Nitrogen Fertilization and Leaf Presence

Agronomy ◽  
2020 ◽  
Vol 10 (12) ◽  
pp. 1982
Author(s):  
Anita Ierna ◽  
Rosario Paolo Mauro ◽  
Cherubino Leonardi ◽  
Francesco Giuffrida
Keyword(s):  
Shelf Life ◽  
Nitrogen Fertilization ◽  
Reducing Sugars ◽  
Growing Season ◽  
N Fertilization ◽  
Fresh Weight ◽  
Total Polyphenols ◽  
Fertilization Rates ◽  
N Dose ◽  
Nitrates Content

Nitrogen (N) fertilization is essential for adequate earliness and the commercial attractiveness of carrots, but its excess could generate fast decay during postharvest, mostly in bunched carrots exhibiting their highly perishable leaves. A field experiment was conducted over the 2016–2017 growing season to address the effects of two N fertilization rates (120 and 240 kg N ha−1, hereafter N120 and N240, respectively) and leaf presence/absence (leaf+ and leaf−) on physicochemical and compositional traits of carrots cv. ‘Dordogne’, after storage at 4.0 ± 0.5 °C, 95–96% relative humidity (RH) for 0, 3, 6, 12, and 24 days (hereafter S0–S24). Before storage, carrots were arranged in bunches and packaged in common low-density polyethylene (LDPE) pouches (thickness 95 μm), 54 × 24 cm size, with 16 holes of 5 mm size. N240 carrots compared to N120 showed higher cumulative weight loss (CWL) and firmness reduction, with differences at S24 equal to 108 vs. 41 g kg−1 fresh weight (FW) and 13.3 vs. 14.5 N, respectively. N240 compared to N120 increased also the color deviation (ΔE*ab, +126%) and nitrates content (+93%) of carrots and slowed down their temporal increase of total polyphenols and antioxidant activity. Leaf+ carrots compared to leaf boosted CWL and firmness reduction, with differences at S24 equal to 90 vs. 58 g kg−1 FW and 12 vs. 17 N, respectively. In addition, leaf presence increased reducing sugars (+17%) and decreased nitrates (−24%) contents. This research has shown the possibility of improving the desirable quality and shelf-life of carrots by halving the N dose commonly supplied by growers and marketing bunched carrots within 12 days from the start of storage.

A multivariate approach to plant mineral nutrition: dose–response relationships and nutrient dominance in factorial experiments

1985 ◽  
Vol 63 (12) ◽  
pp. 2138-2143 ◽  
Author(s):  
G. R. Shaver ◽  
M. J. Lechowicz
Keyword(s):  
Dose Response ◽  
Nutrient Content ◽  
N Fertilization ◽  
Mineral Elements ◽  
P Fertilization ◽  
Canonical Variates Analysis ◽  
Canonical Variates ◽  
Low Levels ◽  
High Fertilization ◽  
K Fertilization

Canonical variates analysis was used to compare the effects of fertilization on the concentrations of five mineral elements (N, P, K, Ca, and Mg) in young shoot tissues of six tundra plant species of three different growth forms. There were two specific objectives: (i) to determine whether it was possible to describe meaningful dose–response relationships in a multivariate response to fertilization, and (ii) to determine the multivariate effect of N plus P fertilization in comparison with the effects of N or P added alone. The results showed that low levels of N–P–K fertilization caused a shift in multivariate nutrient content that was intermediate between the control values and the shift caused by high fertilization, and in the same direction as the latter. In a June harvest, the effect of N plus P fertilization was very similar to the effect of N fertilization alone. However, in August the N plus P effect was dominated by the response to P alone. In all of the analyses, the fundamental similarities and differences among unfertilized plants of each species and growth form were maintained under fertilization.

FONIO MILLET (DIGITARIA EXILIS) RESPONSE TO N, P AND K FERTILIZERS UNDER VARYING CLIMATIC CONDITIONS IN WEST AFRICA

2009 ◽  
Vol 45 (4) ◽  
pp. 401-415 ◽  
Author(s):  
J. GIGOU ◽  
D. STILMANT ◽  
T. A. DIALLO ◽  
N. CISSÉ ◽  
M. D. SANOGO ◽  
...  
Keyword(s):  
West Africa ◽  
N Fertilization ◽  
Major Elements ◽  
Climatic Conditions ◽  
N Application ◽  
Poor Soil ◽  
K Response ◽  
K Fertilization ◽  
Fonio Millet ◽  
Digitaria Exilis

SUMMARYFonio millet (Digitaria exilis), a small-grained cereal, plays an important role in food security in West Africa. As part of efforts to increase its productivity, we studied the effects of moderate levels of nitrogen (0, 15.0 and 30.0 kg N ha−1), phosphorus (0, 6.6 and 13.2 kg P ha−1) and potash (0, 12.5 and 25.0 kg K ha−1) fertilizers under varying climatic conditions. The three experimental sites at Bareng and Bordo in Guinea, and Cinzana in Mali, are representative of the distribution of fonio millet in West Africa. The average recorded grain yields were 1.51 ± 0.229, 1.08 ± 0.141 and 0.47 ± 0.182 t ha−1 in Bareng, Bordo and Cinzana, respectively. We observed a marginal to significant impact of N fertilization coupled, in Bordo, with a significant interaction with the P and K response. This interaction was highlighted by the limited effect of N without P or K fertilization or with the application of only one of these two major elements. Overall, N application as low as 15 kg ha−1 led to a 12–22% increase in production if the P and K applications were not limited. For better control over the risks associated with poor soil fertility and limited rainfall, it appeared to be more effective to apply moderate levels of N, P and K fertilizers to the fonio millet crop than a large amount of one of these nutrients.

scholarly journals Yield, Growth, and Mineral Nutrition of Young `Ray Ruby' Grapefruit Trees under Trickle or Flood Irrigation and Various Nitrogen Rates

1992 ◽  
Vol 117 (1) ◽  
pp. 22-27 ◽  
Author(s):  
Dariusz Swietlik
Keyword(s):  
Mineral Nutrition ◽  
Soil Depth ◽  
Fruit Size ◽  
Growth Yield ◽  
N Fertilization ◽  
Citrus Paradisi ◽  
Pan Evaporation ◽  
Class A ◽  
Size Growth ◽  
Class A Pan

Growth, fruiting, and mineral nutrition of trickle- or flood-irrigated young `Ray Ruby' grapefruit (Citrus paradisi Macf.) trees on sour orange (C. aurantium L.) rootstock were compared in a 4-year field study. Trickle irrigations (two emitters per tree) were scheduled based on: 1) 0.7 (first 3 years) or 0.5 (4th year) of Class A pan evaporation (TPAN) adjusted to the ground area covered by tree canopies, or 2) tensiometer readings (TTEN) of - 0.02 MPa at 30-cm soil depth. The flood irrigations (FLOOD) were scheduled at 50% available soil water depletion at 30 cm (first 3 years) or 30- and 60-cm soil depth (the 4th year). Nitrogen at NO (none), N1(20, 40, 80, 160 g N/tree per year in the four consecutive years), or N2(twice the amount of NJ was injected into the trickle lines from January to August or, under FLOOD, split into January and May soil applications. TPAN and TTEN trees were irrigated with <10% of the water amount applied to FLOOD trees without negatively affecting tree growth, yield, or fruit size. Growth of the trees was not affected by N fertilization, but fruit count and yield and leaf N concentration were increased by the N1 and N2 treatments in the fourth growing season. Frequent N fertigations under the trickle system provided no benefits over two split-soil broadcast applications under the flood system. Fruit size was reduced by the N2 treatment. Based on the water amounts applied to TTEN trees, irrigation needs under the trickle system were estimated to be 0.75, 0.57, 0.30, and 0.20 of Class A pan evaporation adjusted to the ground area covered by the plant canopies, in the first, 2nd, 3rd, and 4th year of orchard life. The decreasing pan coefficient indicated increasing extraction of water from outside the irrigated zones. Roots of TPAN and TTEN trees grew at least 210 cm past the wetted zones into the row middles. More than half of the roots in the TPAN and TTEN treatments were found at 60- to 230-cm soil depth compared to only 17% in the FLOOD treatment.

scholarly journals INFLUENCE OF IRRIGATION TREATMENTS ON PEACH GROWTH AND YIELD

HortScience ◽  
1990 ◽  
Vol 25 (8) ◽  
pp. 853b-853
Author(s):  
Susan M. Huslig ◽  
Michael W. Smith
Keyword(s):  
Fruit Size ◽  
Ground Cover ◽  
Fruit Growth ◽  
Growth And Yield ◽  
Stage Iii ◽  
Trickle Irrigation ◽  
Flower Bud ◽  
Matric Potential ◽  
Orchard Floor Management ◽  
Irrigation Treatments

Irrigation schedules were evaluated on `Cresthaven' to determine if water could be conserved without reducing fruit size or yield. Tensiometers were used to schedule trickle irrigation in 1984-88. Treatments were no irrigation or irrigation when soil matric potential reached 40 or 60 KPa 30 cm deep. When production began in 1986, trees were either irrigated until Oct. or until after harvest (1-7 Aug.). In 1989, class A pan evaporation was used to schedule irrigation by replacing 100% evaporation. Trees were irrigated from bud break to harvest or Oct., beginning at stage III fruit growth to harvest or Oct., or not irrigated. The irrigation treatments were in factorial combination with an annual ryegrass ground cover or herbicidestrip. The ryegrass was seeded in Oct., then killed at the onset of stage III fruit growth. Water application was reduced 50% when irrigation was discontinued after harvest compared to irrigation until Oct. Non-irrigated trees had smaller trunks than irrigated trees; however, there were no differences in trunk size among irrigation treatments. Non-irrigated trees yielded less total fruit and fruit over 7-cm diameter than trees irrigated until Oct., but there were no significant differences in yield among irrigated trees. Flower bud density or fruit set was not affected by treatment. The orchard floor management did not affect tree growth or yield.

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