Yield responses of mulla mulla (Ptilotus exaltatus Nees.) seedlings to additions of nitrogen, potassium and phosphorus fertiliser

2000 ◽  
Vol 40 (6) ◽  
pp. 867 ◽  
Author(s):  
R. F. Brennan ◽  
M. G. Webb ◽  
A. M. Crowhurst
Keyword(s):  
Shoot Growth ◽  
Critical Concentration ◽  
Dry Weight ◽  
Nutritional Requirement ◽  
Soil Potassium ◽  
Phosphorus Fertiliser ◽  
Phosphorus And Potassium ◽  
Yield Responses ◽  
Nitrogen Phosphorus ◽  
Growth Of Seedlings

Native plants are increasingly being grown in Western Australia to produce flowers for export and the nutritional requirement of some of these species is not known. The nitrogen, phosphorus and potassium requirements for optimum growth of seedlings of one such species, Ptilotus exaltatus Nees., were measured in the glasshouse experiment reported here. There was a significant (P<0.05) growth response to nitrogen fertilisers over the range 20–80 mg N/kg soil. At all amounts of phosphorus and potassium, except for the nil-phosphorus treatments, the largest amount of applied nitrogen (80 mg N/kg soil) gave the maximum dry weight of shoots. The dry weight of shoots increased with the addition of phosphorus fertiliser up to 40 mg P/kg soil, particularly with 60 mg potassium and 80 mg N/kg soil. The addition of 160 mg P/kg soil and 120 mg K/kg soil depressed shoot growth at 80 mg N/kg soil. Potassium fertiliser increased plant growth at amounts up to about 60 mg K/kg soil. At the seedling stage of growth, critical concentration in shoots for deficiency was about 1.5% for potassium, and 0.9% for phosphorus. Adequate concentrations in shoots were about 1.7–2.7% for potassium, and 1.0–1.6% for phosphorus.

scholarly journals Response of Young Papaya Plants to Nitrogen, Phosphorus, and Potassium Supply

HortScience ◽  
1997 ◽  
Vol 32 (4) ◽  
pp. 603E-603
Author(s):  
Bielinski M. Santos ◽  
Jose P. Morales-Payan
Keyword(s):  
Shoot Growth ◽  
Dry Weight ◽  
Maximum Growth ◽  
Short Term ◽  
Shoot Dry Weight ◽  
Potassium Supply ◽  
Phosphorus And Potassium ◽  
Nitrogen Phosphorus ◽  
K Fertilization ◽  
Term Response

Studies were conducted in the Dominican Republic to determine the short-term response of young `Cartagena Ombligua' papaya (Carica papaya) plants to nitrogen (N), phosphorus (P), and potassium (K) fertilization. N, P2O5, K2O were individually applied 20 days after transplanting at rates 0, 6, 12, 18, and 24 g per plant. Plant height, stem diameter, leaf area, and root and shoot dry weight responded to N and K in a quadratic fashion (N:Y= 30.79+ 1.35X-0.07X2; K20:Y = 30.02 +1.6X - 0.06X2). Maximum growth was obtained with 6 and 18 g of N and K2O, respectively. P fertilization did not significantly affect shoot growth, but it stimulated root growth (Y = 2.02 + 0.41X - 0.013X2).

The growth of Yellow Bells (Geleznowia verrucosa) seedlings in response to additions of nitrogen, potassium and phosphorus fertiliser

1998 ◽  
Vol 38 (4) ◽  
pp. 385
Author(s):  
R. F. Brennan ◽  
A. M. Crowhurst ◽  
M. G. Webb
Keyword(s):  
Plant Growth ◽  
Western Australia ◽  
Growth Response ◽  
Shoot Growth ◽  
Native Plants ◽  
Dry Weight ◽  
Critical Concentrations ◽  
Phosphorus Fertiliser ◽  
N Fertilisers ◽  
Optimum Production

Summary. Native plants are increasingly grown in Western Australia to produce flowers for export. The nitrogen (N), phosphorus (P) and potassium (K) requirements for optimum production of one of these species, Geleznowia verrucosa (Yellow Bells), was measured for 17-week-old seedlings in a glasshouse experiment reported here. There was a significant (P<0.05) growth response to all levels of N fertilisers. At all levels of P and K, except for the nil K treatments, the lowest level of applied N (20 mg N/kg soil) gave the maximum dry weight of shoots. The dry weight of shoots increased with the addition of P fertiliser to the highest level (160 mg P/kg soil), particularly for the lower levels of applied K (0 and 30 mg/kg soil) and the lowest level of applied N (20 mg/kg soil). Combinations of high levels of P (P160) and N (N80) fertiliser severely depressed shoot growth. When applied at greater than 30 mg K/kg soil, K fertiliser depressed plant growth at all levels of N and P when compared with the lower levels of applied K. At the seedling stage of growth, critical concentrations for deficiency of both N and K were 1.3% in shoots. The critical concentrations for toxicity in whole shoots of Yellow Bells appeared to be about 1.7% for N and about 2.2% for K. Adequate concentrations of N were 1.4–1.5%, while 1.7% K appeared adequate for growth of Yellow Bell shoots.

Major litterfall manipulation affects seedling growth and nutrient status in one of two species in a lowland forest in Panama

2013 ◽  
Vol 29 (5) ◽  
pp. 449-454 ◽  
Author(s):  
Andrea G. Vincent ◽  
Edmund V.J. Tanner
Keyword(s):  
Tropical Forest ◽  
Seedling Growth ◽  
Leaf Growth ◽  
Dry Weight ◽  
Nutrient Status ◽  
Lowland Forest ◽  
Foliar Nitrogen ◽  
Litter Addition ◽  
Phosphorus And Potassium ◽  
Nitrogen Phosphorus

Abstract:Leaf litter is an important source of nutrients to tropical forest trees, but its importance for understorey seedling growth is not well understood. Seedlings of Licania platypus (n = 190) and Coussarea curvigemmia (n = 304) were transplanted into deeply shaded forest plots in Panama having received 2 y of litter addition or removal and 7 y of fertilization with nitrogen, phosphorus and potassium combined, and their growth and foliar nutrients measured after 13 and 6 mo respectively. Licania platypus growing in litter addition and removal plots had faster height growth and slower leaf growth respectively than in control plots; C. curvigemmia showed no significant effects apart from lower survival in litter addition plots. These effects may be driven by soil nutrients, as suggested by differences in foliar nitrogen and potassium (but not phosphorus) concentrations, and by a pot experiment in a shadehouse using Ochroma pyramidale seedlings, which showed higher leaf area in soils from litter-addition plots, although seedling dry weight was higher only in fertilized soils. Overall, these results show that for one of two species, understorey seedling growth was increased by 2 y of doubled litterfall, and thus that they were probably nutrient limited even in the relatively fertile soils of this semi-deciduous tropical forest.

scholarly journals Nutrient Interactions and Deficiency Diagnosis in the Lettuce

1955 ◽  
Vol 8 (3) ◽  
pp. 301 ◽  
Author(s):  
DW Goodall ◽  
AE Grant Lipp ◽  
WG Slater
Keyword(s):  
Plant Material ◽  
Dry Weight ◽  
Sand Culture ◽  
Nutrient Interactions ◽  
Stages Of Development ◽  
Culture Experiment ◽  
Foliage Plants ◽  
Phosphorus And Potassium ◽  
The Relationship ◽  
Nitrogen Phosphorus

A sand-culture experiment with lettuces is described, having as its principal purpose the study of the relationship between the potential responses of plants to applications of nitrogen, phosphorus, and potassium fertilizers and the composition of. their foliage. Plants were supplied initially with five levels of these nutrients in all combinations, samples of plant material were taken fot analysis at various stages of development, and at 44 days from sowing additional quantities of nutrients were supplied to some of the cultures in order that their response potentialities might be determined. The present paper analyses the effects of the nutrient interactions on plant dry weight, further results being left to subsequent papers.

THE INFLUENCE OF IRRIGATION TREATMENTS ON YIELDS AND ON FERTILIZER UTILIZATION BY SWEET CORN AND SNAP BEANS

1962 ◽  
Vol 42 (2) ◽  
pp. 219-228 ◽  
Author(s):  
D. C. MacKay ◽  
C. A. Eaves
Keyword(s):  
Sweet Corn ◽  
Sprinkler Irrigation ◽  
Moisture Stress ◽  
Snap Beans ◽  
Natural Rainfall ◽  
Flower Stage ◽  
Irrigation Treatments ◽  
Phosphorus And Potassium ◽  
Yield Responses ◽  
Nitrogen Phosphorus

A range in each of the nutrients – nitrogen, phosphorus and potassium – was applied to an infertile Podzol soil in a split-plot experiment receiving the following sprinkler irrigation treatments: 1) "none", natural rainfall; 2) "minimum", 1 inch per irrigation during the critical stage of flowering to harvest; 3) "optimum", 1 inch per irrigation throughout the crop season; and 4) "excess", 2 inches per irrigation whenever 3) was applied.Both crops responded to irrigation during the flower to harvest stage but snap beans were more sensitive than sweet corn to moisture stress during the pre-flower stage. With both crops, yields from "excess" water were not significantly different from those of the "optimum" treatment.Greater yield responses were obtained from heavy rates of fertilizers with irrigation than without, and as a result the interaction of fertilizer × irrigation was significant in 3 of the 4 years. These effects appeared to be due mostly to the increased nutrient requirements of the larger crops, which resulted when moisture stress was removed, rather than to increased availability of native or applied nutrients. Phosphorus was the only nutrient whose concentration was consistently increased by irrigation, and this was slight.

scholarly journals RESPONSE OF DIFFERENT CUCUMBER HYBRIDS TO GRAFTING ON SQUASH ROOTSTOCK

2017 ◽  
Vol 48 (2) ◽  
Author(s):  
A. H. Abdul Razzaq
Keyword(s):  
Block Design ◽  
Total Yield ◽  
Dry Weight ◽  
Research Station ◽  
Cucurbita Moschata ◽  
Insertion Technique ◽  
Randomized Complete Block Design ◽  
Number Of Leaves ◽  
Phosphorus And Potassium ◽  
Nitrogen Phosphorus

A field experiment was conducted at Unifert Research Station Yousfiah Center of Iraq during spring of 2015 by grafting five cucumber hybrids named Mayadine, Ghazeer, Najim, Emparator and Beit Alpha on the rootstock ES101 (Cucurbita maxima x Cucurbita moschata) used the hole Insertion technique. The experiment content 10 treatments which were the grafted and ungrafted hybrids using randomized complete block design with three replications. The results showed that grafted Emparator (C4G) gave asignificans increase in the number of leaves (124.20 leaf.plant-1), leaf area (1.85 m2), chlorophyll leaf content (603.0 mg.100 g-1), plant dry weight (191.7 g.plant-1) and the amount of absorbed (nitrogen, phosphorus and potassium) by square area which were (17.77, 1.11 and 14.82 g.m-2, respectively). However, grafted Nagim (C3G) showed an increase in fruit count (14.03 fruit.plant-1), plant yield (1.53 kg.plant-1, early yield (10.60 ton.ha-1) and total yield (28.77 ton.ha-1).

scholarly journals Biomass production, nutritional requirement of nitrogen, phosphorus and potassium, and concentration of the nutrient solution in oregano

2019 ◽  
Vol 25 (1) ◽  
pp. 17-28
Author(s):  
Cecilia Rocío Juárez-Rosete ◽  
◽  
Juan Apolinar Aguilar-Castillo ◽  
Circe Aidín Aburto-González ◽  
Gelacio Alejo-Santiago ◽  
...  
Keyword(s):  
Biomass Production ◽  
Nutrient Solution ◽  
Nutritional Requirement ◽  
Phosphorus And Potassium ◽  
Nitrogen Phosphorus

scholarly journals Changes in Mineral Nutrient Concentrations in Petunia Corollas during Development and Senescence

HortScience ◽  
2003 ◽  
Vol 38 (1) ◽  
pp. 71-74 ◽  
Author(s):  
Sven Verlinden
Keyword(s):  
Ethylene Production ◽  
Dry Weight ◽  
Potassium Content ◽  
Mineral Nutrient ◽  
Nutrient Concentrations ◽  
Fresh Weight ◽  
Low Concentrations ◽  
Calcium Magnesium ◽  
Phosphorus And Potassium ◽  
Nitrogen Phosphorus

To observe changes in the nutritional status of corollas during development and senescence, Petunia ×hybrida cv. Mitchell corollas were analyzed for macronutrient and micronutrient content, dry weight, fresh weight, and ethylene production. Carbon content decreased at slightly lower rates than dry weight during corolla development between anthesis and senescence, while fresh weight and ethylene production followed patterns expected of climacteric flowers. Nitrogen, phosphorus, and potassium content declined during development. Both phosphorus and potassium content gradually declined throughout development with overall losses of about 75% and 40%, respectively. Nitrogen content declined 50% during development but losses occurred only during the final stages of senescence. No significant changes were observed in sulfur, calcium, magnesium, and micronutrient content of the corollas during development. Most elements were present in much lower concentrations in corollas than in leaves. The concentrations of calcium, magnesium, and manganese were about 1-, 5-, and 15-fold lower in corollas than in leaves, respectively. Results indicate that remobilization of selected macronutrients from corollas occurred before and during senescence. Taken together with the presence of low concentrations of macronutrients, my data support the contention that petunia corollas are nutritionally in expensive and therefore easily disposable organs.

scholarly journals The Response of Cotton to Fertilizers in Puerto Rico

1969 ◽  
Vol 43 (2) ◽  
pp. 89-102
Author(s):  
G. Samuels ◽  
J. P. Rodríguez ◽  
P. Landrau, Jr.
Keyword(s):  
Puerto Rico ◽  
Leaf Blade ◽  
Dry Weight ◽  
Fine Sand ◽  
Weight Basis ◽  
Silty Clay ◽  
Clay Loam ◽  
Silty Clay Loam ◽  
Phosphorus And Potassium ◽  
Nitrogen Phosphorus

The results of the six fertilizer experiments with cotton carried on at Isabela, Aguirre, and Lajas, from 1943 to 1956, indicated that: 1. Cotton growing in Guayabo fine sand responded to phosphate and potash fertilizers. The use of 1,000 pounds of 5-10-10 per acre was recommended for this soil. 2. The use of nitrogen at 82 pounds per acre produced the only significant response to fertilizers for a Coto clay. 3. Cotton growing in Altura loam responded significantly only to applications of 100 pounds of nitrogen per acre. 4. Cotton growing on a Santa Isabel silty clay loam did not respond to nitrogen, phosphates, nor potash fertilizers. 5. The fertilizer demands of cotton growing in Santa Isabel clay appeared to be highest for nitrogen and phosphates, with no response to potash. The intensity of these needs varied somewhat with the cotton variety planted. 6. Leaf-blade rather than the petiole tissue was found to be most reliable for foliar analyses in determining the appropriate levels of nitrogen, phosphorus, and potassium in the plant tissue. 7. Leaf samples taken 45 days after planting revealed the greatest difference in response to fertilizers as compared to 60 and 90 days. 8. For tentative use as leaf standards for Sea Island cotton: It is suggested that leaf blades containing, on a dry weight basis at 45 days after planting, above 5.00 percent of nitrogen should show no response to additional nitrogen; above 0.40 percent of phosphorus, no response to phosphates; and, above 3.20 percent of potassium, no response to potash.

Allelopathic inhibition of black cherry by fern, grass, goldenrod, and aster

1977 ◽  
Vol 7 (2) ◽  
pp. 205-216 ◽  
Author(s):  
Stephen B. Horsley
Keyword(s):  
Seed Germination ◽  
Root Growth ◽  
Shoot Growth ◽  
Ground Cover ◽  
Dry Weight ◽  
Low Density ◽  
Black Cherry ◽  
Wild Oat ◽  
Allelopathic Interference ◽  
Growth Of Seedlings

Small black cherry (Prunusserotina Ehrh.) seedlings grow slowly and soon die in low-density cherry–maple (Acerrubrum L.) orchard stands colonized by a dense ground cover of bracken fern (Pteridiumaquilinum L.), wild oat grass (Danthoniacompressa Aust.), goldenrod (Solidagorugosa Ait.), and flat-topped aster (Asterumbellatus Mill.). Studies of orchard stand persistence indicated that allelopathic interference occurred between black cherry seedlings and the herbaceous ground-cover plants. Foliage extracts of fern, goldenrod, and aster inhibited seed germination; aster foliage extract inhibited both shoot and root growth of seedlings growing on cotyledonary reserves; foliage extracts of fern, grass, goldenrod, and aster and root washings of goldenrod and aster inhibited shoot growth and dry weight accumulation of seedlings that had exhausted cotyledonary reserves. Soil from the upper horizons of an orchard stand did not moderate the toxicity of the herbaceous foliage extracts or root washings.

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