scholarly journals Yield response of African leafy vegetables to nitrogen, phosphorus and potassium: The case of Brassica rapa L. subsp. chinensis and Solanum retroflexum Dun.

Water SA ◽  
2018 ◽  
Vol 33 (3) ◽  
pp. 355 ◽  
Author(s):  
W Van Averbeke ◽  
K.A. Juma ◽  
T.E. Tshikalange
Keyword(s):  
Brassica Rapa ◽  
Leafy Vegetables ◽  
Yield Response ◽  
Solanum Retroflexum ◽  
African Leafy Vegetables ◽  
Phosphorus And Potassium ◽  
Nitrogen Phosphorus

scholarly journals Exploring the Yield Response of Paddy (Oryza sativa L.) under Varying Levels of Soil Nitrogen, Phosphorus and Potassium

2020 ◽  
Vol 31 (4) ◽  
pp. 01
Author(s):  
H. P. G. T. N. Kulasinghe ◽  
U. W. A. Vitharana ◽  
R. S. Dharmakeerthi ◽  
D. N. Sirisena ◽  
W. M. U. K. Rathnayake
Keyword(s):  
Oryza Sativa ◽  
Soil Nitrogen ◽  
Yield Response ◽  
Phosphorus And Potassium ◽  
Nitrogen Phosphorus

scholarly journals Yield Response of the Puerto Rico and Columnaris Coffee Cultivars in Two Latosols of Puerto Rico, as Affected by Different Levels of Nitrogen, Phosphorus, Potassium, and Lime

1969 ◽  
Vol 48 (3) ◽  
pp. 255-262
Author(s):  
Saulo J. Rodríguez ◽  
R. Bosque-Lugo ◽  
R. Pérez-Pérez ◽  
A. Rodríguez-Cabrera
Keyword(s):  
Puerto Rico ◽  
Plant Nutrients ◽  
Yield Response ◽  
Lateritic Soils ◽  
Nitrogen Levels ◽  
Phosphorus And Potassium ◽  
Nitrogen Phosphorus ◽  
Different Levels

A set of four experiments with increasing levels of the three main plant nutrients and liming were established in two lateritic soils at two locations in the coffee-growing area of Puerto Rico. Two coffee cultivars were used in the experiments. The results obtained can be summarized as follows: 1. Nitrogen levels significantly affected coffee yields of the Puerto Rico cultivar in a Catalina clay at Maricao grown under shade. 2. Phosphorus and potassium did not significantly affect the yields of these coffee cultivars at the two locations. 3. Liming did not significantly affect the yields.

scholarly journals Modeling of rose coco beans using twenty four points optimum second order rotatable design

2017 ◽  
Vol 5 (2) ◽  
pp. 96
Author(s):  
Isaac Tum ◽  
John Mutiso ◽  
Joseph Koske
Keyword(s):  
Response Surface ◽  
Maximum Yield ◽  
Second Order ◽  
Three Dimensions ◽  
Coefficient Of Determination ◽  
Yield Response ◽  
Efficient Production ◽  
Phosphorus And Potassium ◽  
Nitrogen Phosphorus ◽  
Rotatable Design

The response surface methodology (RSM) is a collection of mathematical and statistical techniques useful for the modeling and analysis of problems in which a response of interest is influenced by several variables, and the objective is to optimize the response. The objective of the study was to model the rose coco beans (Phaseolus vulgaris) through an existing A-optimum and D-efficient second order rotatable design of twenty four points in three dimensions in a greenhouse setting using three inorganic fertilizers, namely, nitrogen, phosphorus and potassium. Thus, the objective of the study was accomplished using the calculus optimum value of the free/letter parameter f=1.1072569. This was done by estimating the parameters via least square's techniques, by making available for the yield response of rose coco beans at calculus optimum value design for the first time. The results showed that, the three factors: nitrogen, phosphorus, and potassium contributed significantly on the yield of rose coco beans (p<0.05). In GP3G, the second-order model was adequate for 1% level of significance with p value of 0.0034. The analysis of variance (ANOVA) of response surface for rose coco yield showed that this design was adequate due to satisfactory level of a coefficient of determination, R2, 0.8066 and coefficient variation, CV was 10.30. This study demonstrated the importance of statistical methods in the optimal and efficient production of rose coco beans. We do recommend a randomize screening of all the fertilizer components with which it has influence on rose coco beans be done to ascertain the right initial amount of each fertilizer that could achieve maximum yield than this study realized.

Fertilizer responses with non-irrigated Shiraz grapevines, 1944-1966

1970 ◽  
Vol 21 (2) ◽  
pp. 243 ◽  
Author(s):  
HW Tulloch ◽  
WB Harris
Keyword(s):  
South Australia ◽  
Growth And Yield ◽  
Yield Response ◽  
Positive Interaction ◽  
Severe Reduction ◽  
Factorial Trial ◽  
Phosphorus And Potassium ◽  
One Year ◽  
Nitrogen Phosphorus

A long-term factorial trial with nitrogen, phosphorus, and potassium fertilizers was started at Nuriootpa Viticultural Station, South Australia on the grape cultivar Shiraz in 1944. Results show a significant yield response to superphosphate. Long-term applications of ammonium sulphate resulted in severe reduction of vine growth and yield, and a significant lowering of soil pH. No direct response to potassium sulphate was obtained except in one year, but a positive interaction between potassium and phosphorus occurred in some years. An analysis of the components of yield in 1964 showed that the increase in yield with superphosphate was due to an increase in the number of berries per bunch. The nitrogen, phosphorus, and potassium contents of petioles were determined and related to available reference standards.

Response of `Spineless Beauty' Zucchini (Cucurbita sp.) to Nitrogen, Phosphorus, and Potassium Fertilization

HortScience ◽  
1998 ◽  
Vol 33 (3) ◽  
pp. 445d-445
Author(s):  
J. Pablo Morales-Payan
Keyword(s):  
Field Trials ◽  
Fruit Yield ◽  
Yield Response ◽  
K Fertilizer ◽  
Direct Seeded ◽  
Phosphorus And Potassium ◽  
Fruit Harvest ◽  
Fertilizer Rates ◽  
Nitrogen Phosphorus ◽  
K Fertilization

Field trials were conducted in Nigua, San Cristobal, Dominican Republic, to determine the yield response of `Spineless Beauty' zucchini (Cucurbita sp.) to nitrogen (N), phosphorus (P), and potassium (K) soil applications in a loamy clay soil containing 4.3% organic matter, 3 parts per million (ppm) of P, and 155 ppm of K. Zucchini was direct-seeded at a distance of 1 m between rows and 0.5 m within rows. Except for N, P, and K fertilization, the crop was grown according to recommended practices. A factorial design (4 × 4 × 4) with four replications was utilized. Rates of N, P, and K were 50, 100, 150, and 200 kg·ha–1, applied as a side dressing 7 days after zucchini emergence. Zucchini fruit harvest started 40 days after crop emergence and every other day thereafter during 20 days. Analysis of variance was performed on the resulting data. Results indicate that there were significant interactions of N, P, and K fertilizer rates on `Spineless Beauty' fruit yield; therefore, nutrient combinations were considered as individual treatments. Significantly superior (lsd 5%) fruit yield was obtained with 150, 150, and 50 kg·ha–1 N, P, and K, respectively.

EFFECT OF NITROGEN, PHOSPHORUS AND POTASSIUM ON YIELDS AND NUTRIENT LEVELS IN THE LEAVES OF PROCESSING PEAS

1968 ◽  
Vol 48 (3) ◽  
pp. 225-233 ◽  
Author(s):  
R. F. Bishop ◽  
C. R. MacEachern ◽  
J. S. Leefe ◽  
H. B. Cannon
Keyword(s):  
Chemical Properties ◽  
Yield Response ◽  
Nutrient Levels ◽  
Consistent Increase ◽  
Phosphorus And Potassium ◽  
Nitrogen Phosphorus ◽  
Leaf N

Fertilizer trials with processing peas were conducted at 15 locations during a 4-year period. Although the soils varied in their chemical properties, there was no general or consistent yield response with increasing rates of N, P or K. There was, however, a consistent increase in leaf N with the higher rates of N and in leaf K with all rates of K. Increasing rates of K were accompanied by decreasing leaf levels of Ca and Mg. The results indicate that N, P and K applied at approximately 25, 50 and 25 kg/ha respectively should be generally adequate.

scholarly journals Impact of Trichoderma-enriched Biofertilizer on the Growth and Yield of Mustard (Brassica rapa L.) and Tomato (Solanum lycopersicon Mill.)

2012 ◽  
Vol 10 (2) ◽  
pp. 109-119 ◽  
Author(s):  
Md Manjurul Haque ◽  
GNM Ilias ◽  
AH Molla
Keyword(s):  
Brassica Rapa ◽  
Significant Role ◽  
Field Condition ◽  
N Fertilizer ◽  
Growth And Yield ◽  
Solanum Lycopersicon ◽  
Crop Cultivation ◽  
Fertilizer Use ◽  
Phosphorus And Potassium ◽  
Nitrogen Phosphorus

Biofertilizer plays a significant role in crop cultivation with reduced the chemical fertilizer use. Three Trichoderma-enriched biofertilizers were evaluated in mustard and tomato cultivation at field condition. Sole application of biofertilizers didn’t show remarkable contribution but all Trichodermaenriched biofertilizers when supplemented with N fertilizer significantly boosted up the growth and yield of mustard and tomato. Application of 50% N fertilizer along with 50% Trichoderma-enriched biofertilizers augmented 108 and 203% yields over control both in mustard and tomato, respectively which were 81.90 and 61.82% in mustard and tomato at standard doses of Nitrogen, Phosphorus and Potassium fertilizers. The present results suggest that Trichoderma-enriched biofertilizer could save at least 50% N fertilizer uses for mustard and tomato and could reduce excessive uses of NPK for crop cultivation. DOI: http://dx.doi.org/10.3329/agric.v10i2.13148 The Agriculturists 2012; 10(2) 109-119

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