Dry matter production and partitioning in potato plants subjected to combined deficiencies of nitrogen, phosphorus and potassium

2003 ◽  
Vol 143 (2) ◽  
pp. 215-229 ◽  
Author(s):  
P D JENKINS ◽  
S MAHMOOD
Keyword(s):  
Dry Matter ◽  
Dry Matter Production ◽  
Potato Plants ◽  
Matter Production ◽  
Phosphorus And Potassium ◽  
Nitrogen Phosphorus

Relationships between production, nutrient accumulation, and chlorophyll synthesis in an Eleocharis quadrangulata population

1971 ◽  
Vol 49 (6) ◽  
pp. 883-888 ◽  
Author(s):  
Claude E. Boyd ◽  
David H. Vickers
Keyword(s):  
Standing Crop ◽  
Dry Matter ◽  
Aquatic Macrophytes ◽  
Chlorophyll Synthesis ◽  
Early Spring ◽  
Chemical Substances ◽  
Net Productivity ◽  
Matter Production ◽  
Phosphorus And Potassium ◽  
Nitrogen Phosphorus

Maximum standing crop in an Eleocharis quadrangulata population was estimated at 881 g dry wt./m2. Net daily productivity was highest during May when about 50% of the total standing crop was produced. Net productivity for the entire period of vegetative increase, April 1 to August 4, was 7.0 g/m2 per day. The accumulation of several nutrients, especially nitrogen, phosphorus, and potassium was proportionately more rapid than dry matter production during early spring growth. Net chlorophyll synthesis was also greater during early spring. Patterns of change in dry matter and chemical substances in the E. quadrangulata population were similar to those in populations of other emergent aquatic macrophytes.

Effects of Nitrogen, Phosphorus, Potassium and Magnesium on Growth of the Oil Palm

1972 ◽  
Vol 8 (4) ◽  
pp. 347-353 ◽  
Author(s):  
R. H. V. Corley ◽  
C. K. Mok
Keyword(s):  
Leaf Area ◽  
Oil Palm ◽  
Dry Matter ◽  
Fertilizer Application ◽  
Dry Matter Production ◽  
Matter Production ◽  
Oil Palms ◽  
Net Assimilation ◽  
Nitrogen Phosphorus ◽  
Bunch Yield

SUMMARYPotassium application appeared to increase dry matter production and yield of oil palms, primarily by increasing leaf area, while nitrogen increased both leaf area and net assimilation rate. Responses to phosphorus and magnesium were harder to interpret. Production of vegetative dry matter attained a fairly constant level at the higher rates of fertilizer application, while the ratio of bunch yield to total dry matter production was little affected by fertilizer treatments. The importance of these results for oil palm breeding, and their possible value in diagnosing fertilizer requirements, are briefly discussed.

INFLUENCE DE LA FUMURE, DU CHARGEMENT ET DE L’ALIMENTATION A LA MOULEE SUR LA PRODUCTIVE HERBAGERE ET BOVINE DES PATURAGES

1975 ◽  
Vol 55 (3) ◽  
pp. 711-725
Author(s):  
J. L. DIONNE ◽  
G. LALANDE ◽  
J. GENEST ◽  
C. FERNET
Keyword(s):  
Dry Matter ◽  
Dry Matter Production ◽  
Fertility Level ◽  
Stocking Rate ◽  
Fertilizer Rate ◽  
Matter Production ◽  
Finishing Steers ◽  
Daily Body Weight ◽  
Phosphorus And Potassium ◽  
Fertilizer Rates

The influence of chemical fertilizers, stocking rate and meal supplementation on herbage and beef production was determined in a 3-yr pasture experiment. A stocking rate of 2.47 heads/ha was compared to one of 4.94 heads/ha. At the latter stocking rate, some of the steers were fed meal while on pasture. The fertilizer rates used were 1,121, 2,242 and 3,363 kg/ha of 10–10–10. All factors were combined in a factorial way. The fertility level of the soils was increased due to chemical fertilizer applications and at the highest rate, an excessive buildup of K occurred in soils. Phosphorus and potassium levels in soils were also increased at the highest stocking rate. An increase in fertilizer rate increased the total dry matter production of the herbage by 28%. Most of the increase in dry matter yields was accounted for by the harvesting of herbage surpluses obtained on the pastures fertilized with the highest rate of 10–10–10 and where the stocking rate was 2.47 heads/ha. At the stocking rate of 4.94 heads/ha, it was impossible to maintain the pasture dry matter production to meet the feed requirements of the grazing steers during the complete pasture season, even when the highest fertilizer rate was used. In the second half of the season, the daily body weight gains of the steers decreased by 50%. Feeding meal to the steers from mid-August compensated for the herbage shortage. The growth rate was markedly increased, while the carcasses had a thicker fat cover and a larger eye of lean. Finishing steers on grass pastures exclusively was possible at the stocking rate of 2.47 heads/ha. The maximum fertilizer rate appears to be at 200 kg/ha of each of N, P2O5 and K2O. The optimum rate would be half of this quantity.

scholarly journals EFFETS DE LA DENSITE DU PEUPLEMENT ET DE L’APPORT DES ELEMENTS N, P ET K SUR LA PRODUCTION D’ENSILAGE DE MAIS DE MATURITE DIFFERENTE

1977 ◽  
Vol 57 (3) ◽  
pp. 735-743
Author(s):  
JEAN GENEST ◽  
JEAN-LOUIS DIONNE
Keyword(s):  
Dry Matter ◽  
Plant Density ◽  
Corn Silage ◽  
Matter Production ◽  
Plant Densities ◽  
Silage Production ◽  
Phosphorus And Potassium ◽  
Nitrogen Phosphorus ◽  
K Fertilization ◽  
Corn Hybrid

The experiment was designed to measure the effect of corn maturity, plant density, nitrogen, phosphorus and potassium fertilization on corn silage production. Funk’s G 4252 corn hybrid planted 10 cm apart in rows 75 cm apart produced an average of 18,325 kg/ha of dry matter over 4 yr, when fertilized with 200 kg/ha of N. Nitrogen fertilization, plant density, and choice of hybrid were the most important factors in dry matter production. Yield increases of 30% were associated with a 3% decrease in quality. Optimum yields were predicted for plant densities of 133,000 pl/ha with 180 kg/ha of N. There was no significant response to P and K fertilization. Yearly applications of P at 50 kg/ha allowed an increase in available P in the soil. Even with yearly applications of K at 200 kg/ha, a constant decrease in soil exchangeable K content was observed.

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.

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.

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