scholarly journals FECUNDITY OF THE ROOT WEEVILS BRACHYRHINUS SULCATUS AND SCIOPITHES OBSCURUS ON STRAWBERRY AT DIFFERENT CONDITIONS OF HOST PLANT NUTRITION

1965 ◽  
Vol 45 (3) ◽  
pp. 219-225 ◽  
Author(s):  
W. T. Cram
Keyword(s):  
Plant Nutrition ◽  
Nitrogen Nutrition ◽  
Sand Culture ◽  
Apparent Effect ◽  
Root Weevils ◽  
Black Vine Weevil ◽  
Cyclodiene Insecticides ◽  
Low Levels ◽  
Phosphorus And Potassium ◽  
Nitrogen Phosphorus

Field applications to strawberry of nitrogen, phosphorus and potassium had no significant effect on the fecundity of the obscure root weevil, Sciopithes obscurus Horn, fed on detached leaflets in the laboratory, but when nitrogen was not applied there was a significant reduction in the fecundity of the black vine weevil, Brachyrhinus sulcatus (F.). With strawberry in sand culture, low levels of nitrogen had no apparent effect on the fecundity of S. obscurus but were associated with a significant reduction in the fecundity of B. sulcatus. Some association is suggested between the different effects of nitrogen nutrition on these species and their different susceptibilities to cyclodiene insecticides.

A comparison of growth responses of Douglas fir and Sitka spruce to different nitrogen, phosphorus, and potassium levels in sand culture

1968 ◽  
Vol 46 (5) ◽  
pp. 531-537 ◽  
Author(s):  
R. van den Driessche
Keyword(s):  
Weight Ratio ◽  
Sitka Spruce ◽  
Douglas Fir ◽  
Response To Treatment ◽  
Sand Culture ◽  
Mineral Nutrient ◽  
Growth Responses ◽  
Net Assimilation ◽  
Phosphorus And Potassium ◽  
Nitrogen Phosphorus

Douglas fir and Sitka spruce seedlings were grown in sand culture under controlled mineral nutrient conditions. Nitrogen, phosphorus, and potassium supply levels were varied one nutrient at a time in three separate experiments. The relative growth rate (RGR) of Sitka spruce was found to be higher than that of Douglas fir at high levels of N and K supply, although in all treatments the total dry matter production of Douglas fir was greater than that of Sitka spruce after 95 days. At low levels of P supply the RGR of Douglas fir was greater than that of Sitka spruce.Effects of treatment on RGR were apparently achieved mainly by their effect on net assimilation rate, but leaf weight ratio also showed a small, and significant, response to treatment.

Olive oil composition as a function of nitrogen, phosphorus and potassium plant nutrition

2009 ◽  
Vol 89 (11) ◽  
pp. 1871-1878 ◽  
Author(s):  
Arnon Dag ◽  
Eric Ben-David ◽  
Zohar Kerem ◽  
Alon Ben-Gal ◽  
Ran Erel ◽  
...  
Keyword(s):  
Olive Oil ◽  
Plant Nutrition ◽  
Oil Composition ◽  
Phosphorus And Potassium ◽  
Nitrogen Phosphorus

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.

Accumulation and distribution of mineral elements in the annual lupins Lupinus albus L. and Lupinus angustifolius L

1978 ◽  
Vol 29 (2) ◽  
pp. 267 ◽  
Author(s):  
PJ Hocking ◽  
JS Pate
Keyword(s):  
Lupinus Albus ◽  
Sufficient Conditions ◽  
Mineral Elements ◽  
Sand Culture ◽  
Dry Matter Accumulation ◽  
Phosphorus And Potassium ◽  
Calcium Iron ◽  
Potassium Magnesium ◽  
Nitrogen Phosphorus ◽  
Iron And Manganese

The mineral nutrition of L. albus and L. angustifolius was studied under nutrient-sufficient conditions in sand culture. Mineral accumulation by both species was closely synchronized with dry matter accumulation. Fruits acquired major proportions of the nitrogen, phosphorus, potassium, magnesium and zinc of both species. Leaflets were major sites of accumulation of calcium, iron and manganese; stem and petioles accumulated substantial amounts of potassium, phosphorus, magnesium, copper and sodium. Intensities of intake of calcium, magnesium and iron by roots of L. angustifolius were higher than in L. albus. The situation was reversed for sodium. Cotyledon reserves of nitrogen, phosphorus, potassium and zinc were mobilized to seedling parts with 85–97% efficiency, other elements much less effectively. During fruiting, vegetative parts of the shoot showed net losses of 60–80% of their nitrogen, phosphorus and potassium, 20–50% of their magnesium, iron, zinc, manganese and copper, and less than 15% of their calcium and sodium. Mobilization from vegetative structures was generally more efficient in L. albus than in L. angustifolius. Leaflets showed higher mobilization efficiencies than stem and petioles. Post-anthesis mobilization furnished the equivalent of 23–59% of the fruit's intake of nitrogen, phosphorus, potassium, magnesium and manganese, 10–25% of the zinc, calcium, iron and copper, and 2% or less of the sodium. Nitrogen, phosphorus and potassium attained higher concentrations in fruits than in mature, non-reproductive parts; less mobile elements (calcium, sodium, iron and manganese) showed the opposite effect. Concentrations of sodium and manganese were especially low in fruits of L. angustifolius compared with L. albus.

scholarly journals Nutrient Interactions and Deficiency Diagnosis in the Lettuce III. Nitrogen Content and Response to Nitrogen

1957 ◽  
Vol 10 (3) ◽  
pp. 253 ◽  
Author(s):  
WG Slater ◽  
DW Goodall
Keyword(s):  
Dry Matter ◽  
Nitrate Nitrogen ◽  
Analytical Data ◽  
Sand Culture ◽  
Nutrient Interactions ◽  
Stages Of Growth ◽  
Matter Production ◽  
Subsequent Response ◽  
Phosphorus And Potassium ◽  
Nitrogen Phosphorus

Lettuce plants grown in sand culture, and receiving nitrogen, phosphorus, and potassium at five levels in all combinations, were analysed at different stages of growth for total, soluble, and nitrate nitrogen. An attempt was made to relate these analytical data to the subsequent response (in dry matter production) shown by the plants when a further amount of nitrogen was supplied.

scholarly journals The influence of mineral nutrition, stage of harvest and flower position on seed yield and quality of phaseolus Vulgaris L.

1981 ◽  
Author(s):  
Μιχαήλ Γαβράς
Keyword(s):  
Seed Yield ◽  
Plant Nutrition ◽  
Seed Quality ◽  
Mother Plant ◽  
Yield And Quality ◽  
Phosphorus And Potassium ◽  
Flower Position ◽  
Seed Yields ◽  
Nitrogen Phosphorus

In this work the effects of mother plant nutrition and flower position on the plant in relation to different harvest stages on French beans (Phaseolus vulgaris L. cv. Cascaded; seed yield, quality and progeny performance have been studied. In three pot experiments under glass and one in the field, different levels of nitrogen, phosphorus, potassium and molybdenum were applied to the mother plant and it was found that higher seed yields were obtained with the higher nutrient levels tested, but these high seed yields were not necessarily accompanied by high quality. Seed yield and quality increased with the increase of nitrogen and potassium. The phosphorus effect however, was different, in that the seed yield increased in relation to the levels but the seed quality decreased. Molybdenum was found to be necessary in moderate amounts, especially for the seed quality. The interactions between nitrogen and phosphorus levels (NP) and between nitrogen, phosphorus and potassium (NPK) were found to be very important for bean seed quality, because their significant effect was similar and constantly present in most of the seed vigour components examined. It seems that the combinations of high nitrogen levels with moderate amounts of phosphorus applied to the mother plant resulted in seed of good quality. In one pot experiment under glass the progeny performance was examined, using seed from the 1st mother plant nutrition experiment and it was found that the mother plant nutrition affected the progeny in it*s early stages. This effect disappeared later and no difference in progeny seed yield was found. In two pot experiments under glass the bean pods were harvested at different stages and the pods from the main axis were separated from the pods on the secondary branches grown mainly from the axils of the primary leaves. It was found that the quality of seed from the secondary branches was lower than the quality of seed from the main axis. However, this difference in seed quality became less with the later harvests. The following tests were used to assess seed quality: the official germination test, seedling evaluation test, cold test, and electrical conductivity test. In addition, the seed size was determined and the seeds were analysed for total nitrogen, phosphorus and potassium content.

Nutrient Interactions and Deficiency Diagnosis in the Lettuce V. Potassium Content and Response to Potassium

1958 ◽  
Vol 11 (4) ◽  
pp. 471 ◽  
Author(s):  
AE Grant Lipp ◽  
DW Goodall
Keyword(s):  
Dry Matter ◽  
Analytical Data ◽  
Potassium Content ◽  
Sand Culture ◽  
Nutrient Interactions ◽  
Stages Of Growth ◽  
Matter Production ◽  
Subsequent Response ◽  
Phosphorus And Potassium ◽  
Nitrogen Phosphorus

Lettuce plants grown in sand culture, and receiving nitrogen, phosphorus, and potassium at five levels in all combinations, were analysed at different stages of growth for these elements. An attempt was made to relate these analytical data to the subsequent response (in dry matter production) shown by the plants when a further amount of potassium was supplied.

SOME ASPECTS OF THE RELATION BETWEEN NECTAR SECRETION AND NITROGEN, PHOSPHORUS, AND POTASSIUM NUTRITION

1957 ◽  
Vol 37 (3) ◽  
pp. 220-236 ◽  
Author(s):  
R. W. Shuel
Keyword(s):  
Red Clover ◽  
Inhibitory Effect ◽  
Threshold Concentration ◽  
Sand Culture ◽  
Nectar Secretion ◽  
High Concentration ◽  
Potassium Secretion ◽  
High Concentrations ◽  
Phosphorus And Potassium ◽  
Nitrogen Phosphorus

The influence of mineral nutrition on nectar secretion both per se and in relation to certain aspects of growth and development was studied in snapdragon and red clover plants growing in sand culture. Snapdragon was grown at two levels each of nitrogen, phosphorus, and potassium, red clover at three levels each of phosphorus and potassium. The volume of nectar and weight of nectar sugar secreted per inflorescence were affected by the supply of each of the elements studied. Secretion in snapdragon was favoured by the lower levels of nitrogen, phosphorus, and potassium. Secretion in red clover was best at the low and intermediate levels of phosphorus and at the intermediate level of potassium. Although a high concentration of phosphorus or potassium in the mineral supply reduced secretion in both species, the threshold concentration for this inhibitory effect was higher in red clover than in snapdragon. High concentrations of potassium consistently reduced the sugar concentration of the nectar in both species. Flower number as well as quantity of secretion per inflorescence varied with nutritional treatment. For maximal production of nectar by the plant, the following conditions of fertility would appear desirable: A level of nitrogen low enough to avoid excessive vegetative growth, a level of phosphorus sufficient to promote good flowering, and a level of potassium which is neither low enough to limit growth severely nor high enough to reduce flower production.

scholarly journals Nutrient Interactions and Deficiency Diagnosis in the Lettuce IV. Phosphorus Content and Response to Phosphorus

1958 ◽  
Vol 11 (1) ◽  
pp. 30 ◽  
Author(s):  
AE Grant Lipp ◽  
DW Goodall
Keyword(s):  
Growth Response ◽  
Phosphorus Content ◽  
Analytical Data ◽  
Sand Culture ◽  
Nutrient Interactions ◽  
Stages Of Growth ◽  
Phosphorus And Potassium ◽  
Nitrogen Phosphorus

Lettuce plants grown in sand culture, and recelvmg nitrogen, phosphorus, and potassium at five levels in all combinations, were analysed at different stages of growth for these elements. An attempt was made to relate these analytical data to the growth response following a supplementary application of phosphorus.

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