scholarly journals 262 FERTIGATION VERSUS DRY APPLICATION OF NITROGEN AND PHOSPHORUS FERTILIZER IN IRRIGATED `GALA' AND `FUJI' APPLES

HortScience ◽  
1994 ◽  
Vol 29 (5) ◽  
pp. 467c-467
Author(s):  
Frank J. Peryea
Keyword(s):  
Treatment Effects ◽  
Fertilizer Application ◽  
Apple Orchard ◽  
Phosphorus Fertilizer ◽  
Nitrogen And Phosphorus ◽  
Cross Sectional ◽  
Size Groups ◽  
Fuji Apple ◽  
Leaf P ◽  
Leaf N

Differential fertilizer application method (single dry, split dry, fertigated liquid), irrigation method (drip, microjet), and nutrient source (N vs. N+P in year 2+) were established in Spring 1992 in a newly planted Gala and Fuji apple orchard. In Spring 1993, the drip-fertigated Gala trees had 3 times and the drip-fertigated Fuji trees had 8 times more flower clusters per tree than the other treatments Fruiting was not allowed in 1993. Trunk cross-sectional area (TCSA) in Fall 1992 was not influenced by treatments. By Fall 1993, TCSA was still independent of treatment for the Fuji trees; however, the Gala trees fell into two size groups - (larger) microsprinkler-fertigated and split dry broadcast; and (smaller) drip fertigated and single-time spring dry broadcast. TCSA had increased 284% (Fuji) and 265% (Gala) since planting. None of the treatment effects were substantially influenced by fertigating with N+P vs N only. Leaf concentrations of most nutrients were consistently lower in 1993 than in 1992. Leaf Fe was higher in 1993 because the orchard was dustier. Leaf N was lower in the microsprinkler-fertigated trees than in all other treatments. Fertigation with N+P did not consistently produce higher leaf P than the N-only treatments. Leaf Mn varied with treatment: microsprinkler fertigated < drip fertigated, single dry < split dry. Treatment effects on all other elements were inconsistent (K, Ca, Mg, B, Cu) or absent (Zn, Fe).

Effect of combined nitrogen and phosphorus fertilizer application of wheat-maize intercropping system

2014 ◽  
Vol 22 (3) ◽  
pp. 262-269 ◽  
Author(s):  
Deping LIU ◽  
Shuqing YANG ◽  
Haibin SHI ◽  
Xiaobo ZHENG ◽  
Lingyu SUN ◽  
...  
Keyword(s):  
Fertilizer Application ◽  
Phosphorus Fertilizer ◽  
Nitrogen And Phosphorus ◽  
Combined Nitrogen

scholarly journals Effects of Nitrogen and Phosphorus Fertilizer Rates on Maize (Zea mays L.) Growth and Yields in Terraced Lands of Medium and High Altitude Regions of Rwanda

2020 ◽  
Author(s):  
A. Fashaho ◽  
A. O. Musandu ◽  
J. J. Lelei ◽  
S. M. Mwonga ◽  
G. M. Ndegwa
Keyword(s):  
Zea Mays ◽  
High Altitude ◽  
Zea Mays L ◽  
Block Design ◽  
Fertilizer Application ◽  
Phosphorus Fertilizer ◽  
Nitrogen And Phosphorus ◽  
Maize Yields ◽  
Four Levels ◽  
Fertilizer Rates

Depletion of nitrogen and phosphorus in terraced hilly areas of Rwanda has lowered maize (Zea mays L.) production. Trials were carried out in 2017 and 2018 in four-year-old-terraced Lixisols and Acrisols of medium and high altitudes to determine effect of nitrogen and phosphorus fertilizer application rates on maize yields. A factorial arrangement of four levels of nitrogen (0, 60, 120 and 180 kg N ha-1) and phosphorus (0, 40, 80 and 120 kg P2O5 ha-1) in a randomized complete block design with 3 replications, was used. Results showed that combinations of 120 - 180 kg N ha-1 and 80 - 120 kg P2O5 ha-1 resulted in significantly (P less than 0.05) higher increases in plant height (45 – 60 % and 56 – 70 % over the control), stem collar diameter (63 – 74 % and 43 % over the control) and grain yields (3 times over the control; i.e. 6.40 – 6.46 t ha-1 and 6.02 - 6.12 t ha-1) in medium and high altitude sites. The optimum fertilizer rates are 176.6 kg N ha-1 and 96.2 kg P2O5 ha-1 in terraced Lixisols of medium altitude area. Land use needs to adjust fertilizer application to these optimum rates for enhanced maize yields in this area and other regions with similar agro-ecological characteristics. Further studies on integrated effects of N and P fertilizers are recommended.

Effects of Environment and Cultural Conditions on Nitrogen and Phosphorus in Coffee Leaves

1969 ◽  
Vol 5 (4) ◽  
pp. 301-309 ◽  
Author(s):  
J. B. D. Robinson
Keyword(s):  
Nutritional Status ◽  
Regression Equation ◽  
Quadratic Regression ◽  
Nitrogen And Phosphorus ◽  
Total N ◽  
Organic Mulch ◽  
Cultural Conditions ◽  
Leaf P ◽  
P Fertilizers ◽  
Leaf N

SummaryAnalyses of total N and P in coffee leaves from different geographic areas have been compared. The levels of these nutrients are correlated with each other and the quadratic regression equation for leaf N on leaf P has been derived. The value of N/P ratio in the coffee leaf for diagnosing nutritional status is assessed. No correlations were observed between Mg and either N or P. Irrigation of coffee in Kenya on latosolic soils raises leaf P but not N levels, in the absence of organic mulch and fertilizers. Effects of organic mulch, N and P fertilizers on leaf levels of N or P are discussed.

scholarly journals Phosphorus Removal With Grass In An Apple Orchard Under Influence Of Mulch And Irrigation

2015 ◽  
Vol 1 ◽  
pp. 83
Author(s):  
Valentīna Surikova ◽  
Aldis Kārkliņš
Keyword(s):  
Phosphorus Removal ◽  
Fertilizer Application ◽  
Apple Orchard ◽  
Phosphorus Fertilizer ◽  
State Institute ◽  
Fruit Growing ◽  
P Balance ◽  
Grass Growth ◽  
Agriculture Systems ◽  
Phosphorus Turnover

Phosphorus leaching from intensive agriculture systems is one of major contributors responsible for pollution of ground-water and surface water bodies. The aim of this study was to determine the content of phosphorus in orchard lawn for reduction of phosphorus fertilizer application and to include the phosphorus from mown grass into P balance and turnover calculation. The investigation was done at the Latvia State Institute of Fruit–Growing in 2009. Three treatments were compared: control, mulch and fertigation. Inter-row strips were covered by grass vegetation. Grass samples were collected at the time of grass mowing. The removal of phosphorus was calculated as kilograms per hectare area. The concentration of phosphorus in the lawn and the height of grass growth were significantly influenced by the mowing time and the soil moisture treatment. These results can be a base for further studies of phosphorus turnover in an orchard, as well as for fertilizer planning and management.

scholarly journals 616 Rootstock, Strain, Ground, and Fertigated Nitrogen Effects on Tree Growth and Development, Nutrition, and Fruit Quality of `Fuji' Apple

HortScience ◽  
1999 ◽  
Vol 34 (3) ◽  
pp. 553E-554
Author(s):  
Esmaeil Fallahi ◽  
Ik-Jo Chun
Keyword(s):  
Fruit Quality ◽  
Preliminary Data ◽  
Growth And Development ◽  
Fruit Color ◽  
Row Spacing ◽  
Cross Sectional ◽  
Fuji Apple ◽  
Mineral Concentrations ◽  
Leaf N

Effects of rootstock and ground and fertigated applied nitrogen on productivity and fruit quality of `Fuji' apple was studied. In the fertigation portion of this project, treatments were as follows: 1) 22.4 kg N/ha per year, 2) 89.7 kg N/ha per year, 3) 89.7 kg N/ha per year plus 78.5 kg K/ha per year; 4) 156.9 kg N/ha per year; 5) 156.9 kg N/ha per year plus 78.5 kg K/ha per year. Fruit had optimum quality when leaf N concentrations were approximately between 1.9% to 2.15% dwt during light-cropping years and approximately between 2.12% to 2.40% during heavy-cropping years. Cross-sectional areas of `Nagafu-6 Fuji' trees were slightly smaller than those in `BC-2 Fuji' trees. Preliminary data also showed that mineral concentrations of leaves from various strains of `Fuji' do not significantly vary. In 1998, trees from 22.4 kg N/ha zone had lower leaf N, resulting in lower leaf area and lower photosynthesis but better fruit color than those with higher N applications. In 1998, trees on Ottawa-3 had higher yield than those on B.9, M.26, and M.7. Trees on B9 had lower leaf N and smaller fruit than those on other rootstocks. Fruit on M.7 rootstock were larger, but had the worst color among all rootstocks. Fruit on M.9 had better color than those other rootstocks. Trees with 2.43-m in-row spacing had significantly higher photosynthesis than those of 1.22-m spacing.

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