THE EFFECT OF VARYING LEVELS OF NITROGEN, PHOSPHORUS AND POTASSIUM AND MANURE ON THE YIELD AND STARCH CONTENT OF POTATOES

The results of an 8-year fertilizer study on the New London Illustration Station, in Prince Edward Island, are presented. A 3 × 3 × 3 factorial fertilizer study was laid down on potatoes each year in turn in one of four adjoining fields, featuring a 4-year rotation of potatoes, oats, clover and timothy hay. Combinations of N, P2O5 and K2O were applied broadcast as sub-plots in a split-plot design with two replicates. Manure treatments at 0 and 10 tons per acre were analyzed as main plots. Data were calculated on the yield and starch content of potatoes from two complete rotation cycles.Manure increased the yield of marketable potatoes by 39.5 and 78.8 bu. per acre, respectively, in the first and second cycle of the rotation. There was no significant interaction of manure by fertilizer treatments. Increased levels of nitrogen and potassium significantly reduced the starch content of tubers but increased yields in proportion to the amounts applied. With phosphorus, no significant yield increases were noted beyond the 120-lb. level during the first rotation cycle. In the second cycle, significant increases in yield were obtained, even up to 240 lb. P2O5 per acre, with no appreciable effect on potato quality.Within the scope of this study, fertilizer elements can be applied in quantities to provide economic yield increase without serious reduction of starch content.

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EFFECTS OF ADDED NITROGEN, PHOSPHORUS, AND POTASSIUM ON LEAF TISSUE BORON CONCENTRATION OF THREE VEGETABLE CROPS

Canadian Journal of Plant Science ◽

10.4141/cjps80-082 ◽

1980 ◽

Vol 60 (2) ◽

pp. 571-576 ◽

Cited By ~ 1

Author(s):

J. A. CUTCLIFFE ◽

UMESH C. GUPTA

Keyword(s):

Brassica Oleracea ◽

Prince Edward Island ◽

Boron Concentration ◽

Leaf Tissue ◽

Vegetable Crops ◽

Brussels Sprouts ◽

Pisum Sativum L ◽

Leaf Tissues ◽

Phosphorus And Potassium ◽

Nitrogen Phosphorus

The effects of various rates of nitrogen, phosphorus, and potassium on the boron concentration of leaf tissue of cauliflower (Brassica oleracea var. botrytis L. ’Snowball Y’), Brussels sprouts (Brassica oleracea var. gemmifera Zenker ’Jade Cross’) and peas (Pisum sativum L. ’Dark Skin Perfection’) were investigated at several locations in Prince Edward Island. Except for N on cauliflower, B concentrations of leaf tissues of these crops were not greatly affected by the N, P, or K treatments. Applied N increased the B concentration of cauliflower leaf tissue at eight of the nine locations investigated.

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Effects of reduced application of special organic fertilizers on tea production

Bangladesh Journal of Botany ◽

10.3329/bjb.v50i5.56448 ◽

2021 ◽

pp. 939-945

Author(s):

Jinbao Liu ◽

Minghui Jin ◽

Zhongan Mao

Keyword(s):

Organic Fertilizer ◽

Economic Benefits ◽

Organic Fertilizers ◽

Treatment Results ◽

Yield Increase ◽

Combined Application ◽

Tea Production ◽

Phosphorus And Potassium ◽

Tea Plants ◽

Nitrogen Phosphorus

A trial of special fertilizer reduction and combined application of organic fertilizer on tea production, nutrients and economic benefits was carried out in the tea garden at Shihe Port, Xinyang, Henan Province, China. The experiment has six treatments of customary fertilization (CK), 100% special fertilizer for tea (T1), nitrogen reduction 20% (T2), 40% (T3), 60% (T4) and 100% (T5), and special fertilizers at the same time. Among the special fertilizer treatments for tea plants, the germination density, 100-bud weight, fresh tea yield, N, P, and K content of new shoots and economic benefits were the highest in T1 treatment, Results showed that the yield range of the five treatments was 460～632.4kg hm2. Compared with CK, the yield increase rates were 6.11, 1.99, -4.21, -13.76 and -22.82%, respectively. The growth rates of barber bud density and 100-bud weight were -20.00～25.83 and 8.40～ 8.40%, respectively. The content of nitrogen, phosphorus and potassium in the new shoots varied by 0.623～1.070, 0.047～0.183 and 1.380～2.237%, respectively. Therefore, the special fertilizer for tea plants can reduce the nitrogen by 20% to save costs and increase efficiency. Bangladesh J. Bot. 50(3): 939-945, 2021 (September) Special

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Effects of NPK Fertilizer on Tuber Yield, Starch Content and Dry Matter Accumulation of White Guinea Yam (Dioscorea rotundata) in a Forest Alfisol of South Western Nigeria

Experimental Agriculture ◽

10.1017/s0014479700013211 ◽

1985 ◽

Vol 21 (4) ◽

pp. 389-393 ◽

Cited By ~ 11

Author(s):

G. O. Kayode

Keyword(s):

Dry Matter ◽

Starch Content ◽

Field Trials ◽

Matter Content ◽

Optimum Level ◽

Dry Matter Content ◽

Dry Matter Accumulation ◽

Phosphorus And Potassium ◽

Nitrogen Phosphorus ◽

Guinea Yam

SUMMARYField trials designed to investigate the effects of nitrogen, phosphorus and potassium on the yield, starch and dry matter content of white guinea yam were conducted over a four year period in south western Nigeria. The optimum level of nitrogen for successful production of white guinea yam was 35 kg ha−1 in a forest Alfisol that had been under cultivation for at least two years. Nitrogen, phosphorus and potassium had no significant effect on starch content, but large applications of phosphorus and potassium significantly decreased dry matter accumulation.

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THE RESPONSE OF NATIVE STANDS OF LOWBUSH BLUEBERRY IN NEWFOUNDLAND TO NITROGEN, PHOSPHORUS, AND POTASSIUM FERTILIZERS

Canadian Journal of Plant Science ◽

10.4141/cjps65-023 ◽

1965 ◽

Vol 45 (2) ◽

pp. 145-152 ◽

Cited By ~ 3

Author(s):

A. F. Rayment

Keyword(s):

Vegetative Growth ◽

Average Yield ◽

Vaccinium Angustifolium ◽

Yield Increase ◽

Lowbush Blueberry ◽

Berry Size ◽

Fruit Maturity ◽

Phosphorus And Potassium ◽

Nitrogen Phosphorus ◽

Muriate Of Potash

Native Newfoundland stands of lowbush blueberries (Vaccinium angustifolium Ait.) were fertilized with ammonium nitrate, superphosphate, and muriate of potash in various combinations. Nitrogen caused earlier fruit maturity, increased berry size, and generally reduced fruit numbers, especially when in combination with added phosphorus. When nitrogen was used alone at 50 lb per acre, it gave an average yield increase of over 50% in the first pickings.When phosphorus and potassium were used together in the absence of nitrogen, there was an increase in fruit numbers resulting in higher yield. Combination of phosphorus with nitrogen was accompanied by increased vegetative growth of the blueberry and associated plants and decreased yields.

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Effects of Age at Harvest and Fertilizer Application on the Yield, Available Carbohydrates and Hydrocyanic Acid Content of Cassava (Manihot palmata Pohl)

The Journal of Agricultural Science ◽

10.1017/s0021859600037370 ◽

1977 ◽

Vol 88 (3) ◽

pp. 679-681

Author(s):

G. O. Obigbesan ◽

A. O. Ketiku ◽

A. A. Fayemi

Keyword(s):

Acid Content ◽

Fertilizer Application ◽

Hydrocyanic Acid ◽

Nitrogen And Phosphorus ◽

Growing Seasons ◽

Significant Yield ◽

Phosphorus And Potassium ◽

Nitrogen Phosphorus

SUMMARYExperiments were carried out over two growing seasons to find out the effects of fertilizer application and age at harvest on the yield, available carbohydrates and hydrocyanic acid content of Manihot palmata.Fertilizers were applied at the following rates: 0–0–0; 45–45–0; 45–45–45; 45–45–67, and 45–45–90 kg/ha of nitrogen, phosphorus and potassium respectively. Harvests were at 9 and 15 months after planting. Application of nitrogen and phosphorus resulted in significant yield increases. Fertilizer application had no significant effect on the hydrocyanic acid content of the tubers. Harvesting at 15 months gave more than double the tuber yields and a higher percentage of hydrocyanic acid than harvesting at 9 months. It is, therefore, desirable to use efficient methods of processing the tubers harvested at 15 months to obtain safe products for industrial and nutritional uses.

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Performance of Cassava (Manihot esculenta Crantz) Varieties under Different Soil Amendments

Journal of Experimental Agriculture International ◽

10.9734/jeai/2019/v41i330398 ◽

2019 ◽

pp. 1-7

Author(s):

Kwadwo Gyasi Santo ◽

Joseph Sarkodie-Addo

Keyword(s):

Starch Content ◽

Block Design ◽

Organic Fertilizer ◽

Poultry Manure ◽

Fertilizer Application ◽

Nitrogen And Phosphorus ◽

Manihot Esculenta Crantz ◽

Combined Application ◽

Phosphorus And Potassium ◽

Nitrogen Phosphorus

Studies were carried out at Offinso in the Ashanti Region of Ghana to assess root quality of cassava grown with application of poultry manure and NPK 15-15-15 and NPK 23-10-10 fertilizers. The experimental design was a 2 x 6 factorial, arranged in a Randomized Complete Block Design (RCBD) with three replications. The treatments consisted of two cassava varieties in combination with five inorganic and/or organic fertilizer formulations and a control with no fertilizer. The parameters measured were starch content, poundability, nitrogen, phosphorus and potassium contents of cassava roots. The data collected were subjected to analysis of variance using the Genstat Statistical package. The results of the study indicated that Bankyehemaa produced higher starch content (29.86%) than the Nkabom variety. Fertilizer application increased starch content with the combined application of poultry manure and NPK 23-10-10 treatment recording the highest treatment effect (30.40%). Both the organic and inorganic fertilizers applied increased starch content of cassava roots. Poundability was not also affected by both variety and fertilizer application. However, roots treated with NPK 15-15-15 only and poultry manure alone were very poundable (3.0). Variety significantly affected only nitrogen and phosphorus contents of cassava roots. Bankyehemaa had higher content (0.72%) of nitrogen than Nkabom, while Nkabom recorded higher content (1.05%) of phosphorus than Bankyehemaa. Generally, application of fertilizer significantly affected root contents of nitrogen, phosphorus and potassium. However, potassium and phosphorus contents were reduced by the organic fertilizer (poultry manure). The NPK 15-15-15 treatment produced higher potassium (9.37%) and phosphorus (1.36%) contents of roots than the other treatments. The highest nitrogen content of roots (0.78%) was observed in the combined application of poultry manure and NPK 23-10-10 treatment.

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The Optimum Dose of Nitrogen, Phosporus, and Potassium to Improve Soybean (Glycine max (L) Merr) Productivity on Kayu Putih (Melaleuca cajuputi) Stands

Ilmu Pertanian (Agricultural Science) ◽

10.22146/ipas.17991 ◽

2017 ◽

Vol 2 (2) ◽

pp. 056

Author(s):

Roni Ismoyo Jati ◽

Tohari Tohari ◽

Priyono Suryanto

Keyword(s):

Seed Weight ◽

Optimum Dose ◽

K Uptake ◽

Positive Interaction ◽

Melaleuca Cajuputi ◽

Glycine Max L ◽

Main Plot ◽

Phosphorus And Potassium ◽

Nitrogen Phosphorus ◽

Plot Design

It was necessary to obtain optimum dose of nitrogen, phosphorus, and potassium obtained through fertilisation in order to improve productivity in the intercropping. Kayu putih tree was cultivated in Yogyakarta for oil production, and the inter-row was designed for intercropping plants, including soybean. The objective of present study was to obtain optimum dose of urea, SP-36, and KCl for soybean intercropped with kayu putih. The experiment was conducted in Menggoran Forest Resort (RPH Menggoran), Playen Forest Section (BDH Playen), Yogyakarta Forest Management District (KPH Yogyakarta) using split-split plot design. The main plot was urea, subplot was SP-36, and sub-subplot was KCl. Fertilisation consisted of three levels (0, 25, 50 kg ha-1 of urea), (0, 150, 300 kg ha-1 of SP-36) and (0, 75, 150 kg ha-1 of KCl). The results showed that application of 50 kg ha-1 urea, 300 kg. ha-1 SP-36, and 150 kg. ha-1 KCl increased N, P, K uptake per hectare as much as 16.23 kg N ha-1, 86.27 kg P ha-1, 40.02 kg K ha-1, respectively. There was positive interaction between urea and SP-36, SP-36 and KCl at leaf area, photosynthetic rate, number of seeds per plants, seed weight per plants, and seed weight per hectare. Under kayu putih intercropping, optimum dosage of urea, SP-36 and KCl were 0, 298.03 and 87.12 kg ha-1, respectively. These combination enabled to produce maximum seed weight of 2.01 tons. ha-1.

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Farklı Dozlarda Fosfor Uygulamasının Şeker pancarı (Beta Vulgaris L.) Bitkisinin Verimine ve Besin Elementleri Alımına Etkisi

Turkish Journal of Agriculture - Food Science and Technology ◽

10.24925/turjaf.v9i2.420-424.4174 ◽

2021 ◽

Vol 9 (2) ◽

pp. 420-424

Author(s):

Ahmet Demirbaş

Keyword(s):

Sugar Beet ◽

Iron Concentration ◽

Sugar Beet Plant ◽

Plant Nitrogen ◽

Triple Super Phosphate ◽

Sugar Beet Variety ◽

Calcium And Magnesium ◽

Phosphorus And Potassium ◽

Nitrogen Phosphorus ◽

Plot Design

In this study, the effect of different phosphorus doses application on the yield and nutrient uptake of sugar beet plant was investigated under field condition. The study was carried out in Sivas province in 3 replications according to the randomized plot design and Valentina was used as the sugar beet variety. Phosphorus doses were; 0 kg P da-1, 15 kg P da-1, 30 kg P da-1 and applied as triple super phosphate (TSP). Leaf samples were taken approximately 80 days after the planting of sugar beet plant, nitrogen (N), phosphorus (P), potassium (K), calcium (Ca), magnesium (Mg), iron (Fe), zinc (Zn), manganese (Mn), copper (Cu) concentrations and yield were determined at harvest. Research results indicated that the yield increased depending on the increasing phosphorus doses and the highest yield was obtained at 30 kg P da-1 dose with 8151.0 kg da-1. In addition, the highest nitrogen, phosphorus and potassium concentrations were found at 30 kg P da-1 dose (4.77% N, 0.74% P and 2.39% K, respectively). However, the research found that calcium and magnesium concentrations decreased with increasing phosphorus doses. While only iron concentration among microelements increased with phosphorus applications, zinc, manganese and copper concentrations decreased due to increasing phosphorus doses.

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