For all those folks who wanna skinny-dip into this topic ...
Here is a list of plants high in N, P and K ...
(source:
http://www.ars-grin.gov/duke/highchem.html )
Plants Containing NITROGEN
Ordered by quantity
Species Part Quantity Reference
Cucumis sativus L. -- Cucumber Fruit 80,000 ppm
DUKE1992A
Tephrosia purpurea PERS. -- Purple Tephrosia, Wild Indigo Leaf 72,500 ppm
DUKE1992A
Brassica oleracea var. botrytis l. var. botrytis L. -- Cauliflower Leaf 71,800 ppm
DUKE1992A
Acacia farnesiana (L.) WILLD. -- Cassie, Huisache, Opopanax, Popinac, Sweet Acacia Leaf 68,800 ppm
DUKE1992A
Urtica dioica L. -- European Nettle, Stinging Nettle Leaf 55,555 ppm
DUKE1992A
Anethum graveolens L. -- Dill, Garden Dill Plant 55,300 ppm
DUKE1992A
Lactuca sativa L. -- Lettuce Leaf 54,000 ppm
DUKE1992A
Indigofera tinctoria L. -- Common Indigo Leaf 51,100 ppm
DUKE1992A
Pisum sativum L. -- Pea Seed 50,000 ppm
DUKE1992A
Brassica oleracea var. botrytis l. var. botrytis L. -- Cauliflower Flower 47,500 ppm
DUKE1992A
Spinacia oleracea L. -- Spinach Leaf 45,700 ppm
DUKE1992A
Phaseolus vulgaris subsp. var. vulgaris -- Black Bean, Dwarf Bean, Field Bean, Flageolet Bean, French Bean, Garden Bean, Green Bean, Haricot, Haricot Bean, Haricot Vert, Kidney Bean, Navy Bean, Pop Bean, Popping Bean, Snap Bean, String Bean, Wax Bean Fruit 41,000 ppm
DUKE1992A
Petroselinum crispum (MILLER) NYMAN EX A. W. HILLL -- Parsley Leaf 40,700 ppm
DUKE1992A
Arachis hypogaea L. -- Groundnut, Peanut Seed 40,000 ppm
DUKE1992A
Nicotiana tabacum L. -- Tobacco Leaf 40,000 ppm
DUKE1992A
Raphanus sativus L. -- Radish Root 38,570 ppm
DUKE1992A
Armoracia rusticana GAERTN. ET AL. -- Horseradish Root 38,461 ppm
DUKE1992A
Brassica oleracea var. capitata l. var. capitata L. -- Cabbage, Red Cabbage, White Cabbage Leaf 37,500 ppm
DUKE1992A
Annona squamosa L. -- Sugar-Apple, Sweetsop Leaf 36,000 ppm
DUKE1992A
Beta vulgaris subsp. subsp. vulgaris -- Beet, Beetroot, Garden Beet, Sugar Beet Root 35,830 ppm
DUKE1992A
Bromelia pinguin L. -- Wild Pineapple Shoot 35,800 ppm
DUKE1992A
Momordica charantia L. -- Bitter Melon, Sorosi Fruit 33,800 ppm
MPI Melilotus indica LAM. -- Small-Flowered Melilot Plant 33,600 ppm
DUKE1992A
Pastinaca sativa L. -- Parsnip Root 33,160 ppm
DUKE1992A
Hibiscus sabdariffa L. -- Acedera de Guinea (Sp.), Indian Sorrel, Jamaica Sorrel, Kharkadi, Malventee (Ger.), Red Sorrel, Rosa de Jamaica (Sp.), Rosella (Ger.), Roselle, Sereni (Sp.), Sorrel Seed 32,900 ppm
DUKE1992A
Senna obtusifolia (L.) H.IRWIN & BARNEBY -- Sicklepod Seed 31,300 ppm
DUKE1992A
Ilex paraguariensis ST. HIL. -- Mate, Paraguay Tea, South American Holly Leaf 30,000 ppm
DUKE1992A
Corylus avellana L. -- Cobnut, English Filbert, European Filbert, European Hazel, Hazel Seed 28,000 ppm
DUKE1992A
Eriobotrya japonica (THUNB.) LINDL. -- Loquat Seed 26,000 ppm
DUKE1992A
Lycopersicon esculentum MILLER -- Tomato Leaf 26,000 ppm
DUKE1992A
Bixa orellana L. -- Achiote, Annato, Annatto, Annoto, Arnato, Bija, Lipstick Pod, Lipsticktree Seed 25,200 ppm
DUKE1992A
Brassica napus var. napobrassica var. napobrassica (L.) REICHB. -- Rutabaga, Swede, Swedish Turnip Root 25,000 ppm
DUKE1992A
Pterocarpus marsupium ROXB. -- Indian Kino, Malabar Kino, bijasal Leaf 25,000 ppm
DUKE1992A
Zingiber officinale ROSCOE -- Ginger Rhizome 24,440 ppm
DUKE1992A
Crocus sativus L. -- Saffron Silk Stigma Style 24,300 ppm
DUKE1992A
Tephrosia candida (ROXB.) DC. -- White Tephrosia Plant 23,600 ppm
DUKE1992A
Capsicum annuum L. -- Bell Pepper, Cherry Pepper, Cone Pepper, Green Pepper, Paprika, Sweet Pepper Fruit 23,330 ppm
DUKE1992A
Lycopersicon esculentum MILLER -- Tomato Fruit 23,330 ppm
DUKE1992A
Coffea arabica L. -- Coffee Seed 23,000 ppm
DUKE1992A
Theobroma cacao L. -- Cacao Seed 22,800 ppm
DUKE1992A
Rheum rhabarbarum L. -- Rhubarb Pt 22,000 ppm
DUKE1992A
Daucus carota L. -- Carrot Root 20,000 ppm
DUKE1992A
Panax quinquefolius L. -- American Ginseng, Ginseng Plant 20,000 ppm
DUKE1992A
Ribes rubrum L. -- Red Currant, White Currant Fruit 20,000 ppm
DUKE1992A
Apium graveolens L. -- Celery Root 19,090 ppm
DUKE1992A Rubus chamaemorus L. -- Cloudberry Fruit 18,125 ppm
DUKE1992A
Brassica rapa var. rapa -- Rapini, Seven-Top Turnip, Turnip Root 18,000 ppm
DUKE1992A
Spondias dulcis FORST. -- Ambarella Fruit 17,900 ppm
DUKE1992A
Allium cepa L. -- Onion, Shallot Bulb 17,690 ppm
DUKE1992A
Solanum tuberosum L. -- Potato Tuber 17,000 ppm
DUKE1992A
Citrus paradisi MacFAD. -- Grapefruit Fruit 16,360 ppm
DUKE1992A
Rauvolfia serpentina (L.) BENTH. ex KURZ -- Indian Snakeroot, Serpentine Wood Seed 16,000 ppm
DUKE1992A
Musa x paradisiaca L. -- Banana, Plantain Fruit 15,000 ppm
DUKE1992A
Ribes uva-crispa L. -- Gooseberry Fruit 15,000 ppm
DUKE1992A
Genipa americana L. -- Genipap, Jagua Fruit 13,900 ppm
DUKE1992A
Citrus sinensis (L.) OSBECK -- Orange Fruit 13,845 ppm
DUKE1992A
Amphicarpaea bracteata (L.) FERNALD -- Hog Peanut Shoot 0-26,500 ppm
NUT Citrus reticulata BLANCO -- Mandarin, Tangerine Fruit 13,075 ppm
DUKE1992A
Prunus persica (L.) BATSCH -- Peach Fruit 13,075 ppm
DUKE1992A
Ribes nigrum L. -- Black Currant Fruit 12,775 ppm
DUKE1992A Sorbus aucubaria L. -- Rowan Berry Fruit 11,900 ppm
DUKE1992A
Genipa americana L. -- Genipap, Jagua Seed 11,100 ppm
DUKE1992A
Solanum melongena L. -- Aubergine, Eggplant Fruit 10,250 ppm
DUKE1992A
Acrocomia totai MART. -- Gru-Gru Nut, Mbocaya Seed 0-20,200 ppm
NUT
Fragaria spp -- Strawberry Fruit 10,000 ppm
DUKE1992A
Prunus domestica L. -- Plum Fruit 10,000 ppm
DUKE1992A Malva parviflora L. -- Cheeseweed Plant 9,400 ppm
DUKE1992A
Rosa canina L. -- Dog Rose, Dogbrier, Rose Fruit 9,000 ppm
DUKE1992A
Plants Containing PHOSPHORUS
Ordered by quantity
Species Part Quantity Reference
Beta vulgaris subsp. subsp. vulgaris -- Beet, Beetroot, Garden Beet, Sugar Beet Root 45,580 ppm
DUKE1992A Xanthosoma sagittifolium (L.) SCHOTT -- Malanga, Tannia, Yautia Leaf 38,416 ppm
DUKE1992A Chenopodium album L. -- Lambsquarter Leaf 36,833 ppm
DUKE1992A Momordica charantia L. -- Bitter Melon, Sorosi Leaf 33,467 ppm
CRC Physalis ixocarpa BROT. -- Tomatillo Fruit 30,250 ppm
DUKE1992A Linum usitatissimum L. -- Flax, Linseed Seed 20,335 ppm
DUKE1992A Luffa aegyptiaca MILLER -- Luffa, Smooth Loofah, Vegetable Sponge Seed 18,300 ppm
DUKE1992A Lepidium sativum L. -- Garden Cress Seed 17,500 ppm
DUKE1992A Equisetum arvense L. -- Field Horsetail, Horsetail Plant 14,762 ppm
DUKE1992A Citrullus lanatus (THUNB.) MATSUM. & NAKAI -- Watermelon Seed 14,600 ppm
DUKE1992A Luffa aegyptiaca MILLER -- Luffa, Smooth Loofah, Vegetable Sponge Leaf 14,141 ppm
DUKE1992A Sesamum indicum L. -- Ajonjoli (Sp.), Beni, Benneseed, Sesame, Sesamo (Sp.) Leaf 14,000 ppm
DUKE1992A Lactuca sativa L. -- Lettuce Leaf 13,920 ppm
DUKE1992A Phaseolus vulgaris subsp. var. vulgaris -- Black Bean, Dwarf Bean, Field Bean, Flageolet Bean, French Bean, Garden Bean, Green Bean, Haricot, Haricot Bean, Haricot Vert, Kidney Bean, Navy Bean, Pop Bean, Popping Bean, Snap Bean, String Bean, Wax Bean Fruit 13,500 ppm
DUKE1992A Sclerocarya caffra SOND. -- Marula Seed 12,985 ppm
DUKE1992A Cucurbita pepo L. -- Pumpkin Seed 12,982 ppm
DUKE1992A Cucumis sativus L. -- Cucumber Fruit 12,600 ppm
DUKE1992A Ipomoea aquatica FORSSKAL -- Swamp Cabbage, Water Spinach Leaf 12,360 ppm
DUKE1992A Nasturtium officinale R. BR. -- Berro, Watercress Herb 12,000 ppm
DUKE1992A Cannabis sativa L. -- Hemp, Indian Hemp, Marihuana, Marijuana Seed 11,227 ppm
DUKE1992A Phaseolus lunatus L. -- Butter Bean, Lima Bean Sprout Seedling 10,611 ppm
DUKE1992A Raphanus sativus L. -- Radish Fruit 10,526 ppm
DUKE1992A Asparagus officinalis L. -- Asparagus Shoot 10,244 ppm
DUKE1992A Avena sativa L. -- Oats Seed 10,200 ppm
DUKE1992A Cucurbita pepo L. -- Pumpkin Flower 10,100 ppm
DUKE1992A Amaranthus sp. -- Pigweed Leaf 10,082 ppm
DUKE1992A Crescentia alata L. -- Jicaro Seed 10,020 ppm
DUKE1992A Arachis hypogaea L. -- Groundnut, Peanut Plant 10,000 ppm
DUKE1992A Terminalia catappa L. -- Indian Almond, Malabar Almond, Tropical Almond Seed 9,835 ppm
DUKE1992A Erythroxylum coca var. coca -- Coca Leaf 9,740 ppm
DUKE1992A Elytrigia repens (L.) DESV. EX NEVSKI -- Couchgrass, Doggrass, Quackgrass, Twitchgrass, Wheatgrass Plant 9,510 ppm
DUKE1992A
Plants Containing POTASSIUM
Ordered by quantity
Species Part Quantity Reference
Lactuca sativa L. -- Lettuce Leaf 121,800 ppm
DUKE1992A Cichorium endivia L. -- Endive, Escarole Leaf 96,000 ppm
DUKE1992A Vigna mungo (L.) HEPPER -- Black Gram Seed 89,790 ppm
DUKE1992A Chenopodium album L. -- Lambsquarter Leaf 87,100 ppm
DUKE1992A Raphanus sativus L. -- Radish Root 85,700 ppm
DUKE1992A Brassica pekinensis (LOUR.) RUPR. -- Chinese Cabbage Leaf 81,900 ppm
DUKE1992A Portulaca oleracea L. -- Purslane, Verdolaga Herb 81,200 ppm
DUKE1992A Avena sativa L. -- Oats Plant 78,900 ppm
DUKE1992A Chrysanthemum coronarium L. -- Garland Chrysanthemum Bud 76,745 ppm
DUKE1992A Anethum graveolens L. -- Dill, Garden Dill Plant 76,450 ppm
DUKE1992A Taraxacum officinale WEBER EX F. H. WIGG. -- Dandelion Root 75,000 ppm
DUKE1992A Amaranthus sp. -- Pigweed Leaf 73,503 ppm
DUKE1992A Cucumis sativus L. -- Cucumber Fruit 72,500 ppm
DUKE1992A Brassica chinensis L. -- Bok-Choy, Celery Cabbage, Celery Mustard, Chinese Cabbage, Chinese Mustard, Chinese White Cabbage, Pak-Choi Leaf 69,143 ppm
DUKE1992A Spinacia oleracea L. -- Spinach Plant 69,077 ppm
DUKE1992A Borago officinalis L. -- Beebread, Beeplant, Borage, Talewort Leaf 67,210 ppm
DUKE1992A Rheum rhabarbarum L. -- Rhubarb Pt 66,400 ppm
DUKE1992A Nasturtium officinale R. BR. -- Berro, Watercress Herb 66,000 ppm
DUKE1992A Aralia cordata L. -- Udo Leaf 65,950 ppm
DUKE1992A Beta vulgaris subsp. subsp. vulgaris -- Beet, Beetroot, Garden Beet, Sugar Beet Leaf 61,798 ppm
DUKE1992A Lycopersicon esculentum MILLER -- Tomato Fruit 58,800 ppm
DUKE1992A Phaseolus vulgaris subsp. var. vulgaris -- Black Bean, Dwarf Bean, Field Bean, Flageolet Bean, French Bean, Garden Bean, Green Bean, Haricot, Haricot Bean, Haricot Vert, Kidney Bean, Navy Bean, Pop Bean, Popping Bean, Snap Bean, String Bean, Wax Bean Fruit 58,500 ppm
DUKE1992A Apium graveolens L. -- Celery Pt 57,800 ppm
DUKE1992A Lepidium sativum L. -- Garden Cress Leaf 57,170 ppm
DUKE1992A Apium graveolens L. -- Celery Root 56,360 ppm
DUKE1992A Asparagus officinalis L. -- Asparagus Shoot 55,200 ppm
DUKE1992A Houttuynia cordata THUNB. -- Dokudami, Fishwort, Yu Xing Cao Plant 54,300 ppm
DUKE1992A Petroselinum crispum (MILLER) NYMAN EX A. W. HILLL -- Parsley Plant 53,833 ppm
DUKE1992A Colocasia esculenta (L.) SCHOTT -- Taro Leaf 51,774 ppm
DUKE1992A Anthriscus cerefolium (L.) HOFFM. -- Chervil Leaf 51,200 ppm
DUKE1992A Beta vulgaris subsp. subsp. vulgaris -- Beet, Beetroot, Garden Beet, Sugar Beet Root 50,000 ppm
DUKE1992A Lycium chinense MILL. -- Chinese Boxthorn, Chinese Matrimony Vine, Chinese Wolfberry, Chinesischer Bocksdorn (Ger.), Daun Koki (Indones.), Gou Qi (Chin.), Kaukichai (Malays.), Kuko (Jap.), Lyciet de Chine (Fr.), Spina Santa Cinese (Ital.), Wolfberry Leaf 49,808 ppm
DUKE1992A Ipomoea aquatica FORSSKAL -- Swamp Cabbage, Water Spinach Leaf 49,200 ppm
DUKE1992A Brassica oleracea var. botrytis l. var. botrytis L. -- Cauliflower Flower 49,080 ppm
DUKE1992A Coriandrum sativum L. -- Chinese Parsley, Cilantro, Coriander Leaf 48,177 ppm
DUKE1992A Lycopersicon esculentum MILLER -- Tomato Leaf 47,000 ppm
DUKE1992A Perilla frutescens (L.) BRITTON -- Perilla Leaf 46,429 ppm
CRC Daucus carota L. -- Carrot Root 46,360 ppm
DUKE1992A Glechoma hederacea L. -- Alehoof Plant 46,000 ppm
CPB38:2205 Corchorus olitorius L. -- Jew's Mallow, Mulukiya, Nalta Jute Leaf 45,500 ppm
DUKE1992A Momordica charantia L. -- Bitter Melon, Sorosi Fruit 45,000 ppm
CRC Vigna unguiculata subsp. sesquipedalis (L.) VERDC. -- Asparagus Bean, Pea Bean, Yardlong Bean Shoot 44,520 ppm
DUKE1992A Prunus domestica L. -- Plum Fruit 44,200 ppm
DUKE1992A Cucumis melo subsp. ssp melo var.cantalupensis NAUDIN -- Cantaloupe, Melon, Muskmelon, Netted Melon, Nutmeg Melon, Persian Melon Fruit 44,000 ppm
DUKE1992A Hordeum vulgare L. -- Barley, Barleygrass Plant 44,000 ppm
DUKE1992A Brassica napus var. napobrassica var. napobrassica (L.) REICHB. -- Rutabaga, Swede, Swedish Turnip Root 43,850 ppm
DUKE1992A Triticum aestivum L. -- Wheat Plant 43,500 ppm
DUKE1992A Raphanus sativus L. -- Radish Leaf 43,478 ppm
DUKE1992A Ocimum basilicum L. -- Basil, Cuban Basil, Sweet Basil Leaf 42,900 ppm
CRC USA Brassica oleracea var. capitata l. var. capitata L. -- Cabbage, Red Cabbage, White Cabbage Leaf 42,500 ppm
DUKE1992A Ipomoea batatas (L.) LAM -- Sweet Potato Leaf 42,256 ppm
DUKE1992A Petasites japonicus (SIEBOLD & ZUCC.) MAXIM. -- Butterbur Plant 42,000 ppm
DUKE1992A Sechium edule (JACQ.) SW. -- Chayote Shoot 41,890 ppm
DUKE1992A Curcuma longa L. -- Indian Saffron, Turmeric Rhizome 41,271 ppm
DUKE1992A Artemisia vulgaris L. -- Mugwort Plant 41,000 ppm
DUKE1992A Cucurbita pepo L. -- Pumpkin Fruit 40,476 ppm
DUKE1992A Pastinaca sativa L. -- Parsnip Root 40,000 ppm
DUKE1992A Rumex acetosa L. -- Garden Sorrel Leaf 40,000 ppm
DUKE1992A Foeniculum vulgare MILLER -- Fennel Plant 39,700 ppm
DUKE1992A Helianthus tuberosus L. -- Jerusalem Artichoke Tuber 39,700 ppm
DUKE1992A Chrysanthemum coronarium L. -- Garland Chrysanthemum Leaf 39,385 ppm
DUKE1992A Xanthosoma sagittifolium (L.) SCHOTT -- Malanga, Tannia, Yautia Root 39,100 ppm
DUKE1992A Phaseolus lunatus L. -- Butter Bean, Lima Bean Seed 39,000 ppm
DUKE1992A Brassica oleracea var. gongylodes L. -- Kohlrabi Stem 38,890 ppm
DUKE1992A Centella asiatica (L.) URBAN -- Gotu Kola, Pennywort Leaf 38,693 ppm
DUKE1992A Annona cherimola MILL. -- Cherimoya Seed 38,000 ppm
DUKE1992A Brassica oleracea var. botrytis l. var. botrytis L. -- Cauliflower Leaf 37,270 ppm
DUKE1992A Urtica dioica L. -- European Nettle, Stinging Nettle Leaf 37,220 ppm
DUKE1992A Cichorium intybus L. -- Chicory, Succory, Witloof Leaf 37,128 ppm
DUKE1992A Physalis ixocarpa BROT. -- Tomatillo Fruit 36,250 ppm
DUKE1992A Pueraria montana subsp. var. lobata (WILLD.) MAESEN & S. M. ALMEIDA -- Kudsu, Kudzu Shoot 36,050 ppm
DUKE1992A Annona muricata L. -- Soursop Fruit 36,000 ppm
DUKE1992A Phaseolus coccineus L. -- Scarlet Runner Bean Seed 35,807 ppm
DUKE1992A Cucurbita pepo L. -- Pumpkin Flower 35,670 ppm
DUKE1992A Mentha arvensis var. piperascens MALINV. EX L. H. BAILEY -- Cornmint, Field Mint, Japanese Mint Plant 35,100 ppm
SMO Oenothera biennis L. -- Evening-Primrose Herb 35,100 ppm
DUKE1992A Capsicum annuum L. -- Bell Pepper, Cherry Pepper, Cone Pepper, Green Pepper, Paprika, Sweet Pepper Fruit 35,000 ppm
DUKE1992A Nelumbo nucifera L. -- Water Lotus Rhizome 34,925 ppm
DUKE1992A Capsicum frutescens L. -- Cayenne, Chili, Hot Pepper, Red Chili, Spur Pepper, Tabasco Fruit 34,272 ppm
DUKE1992A Panax quinquefolius L. -- American Ginseng, Ginseng Plant 33,800 ppm
DUKE1992A Tephrosia purpurea PERS. -- Purple Tephrosia, Wild Indigo Leaf 33,800 ppm
DUKE1992A Lagenaria siceraria (MOLINA) STANDLEY. -- Calabash Gourd, White-Flowered Gourd Fruit 33,635 ppm
DUKE1992A Liquidambar styraciflua L. -- American Styrax, Sweetgum Stem 33,600 ppm
DUKE1992A Capsella bursa-pastoris (L.) MEDICUS -- Shepherd's Purse Plant 33,390 ppm
DUKE1992A Momordica charantia L. -- Bitter Melon, Sorosi Leaf 33,117 ppm
CRC Artemisia dracunculus L. -- Tarragon Plant 32,719 ppm
DUKE1992A Abelmoschus esculentus (L.) MOENCH -- Okra Fruit 32,500 ppm
DUKE1992A Solanum melongena L. -- Aubergine, Eggplant Fruit 32,000 ppm
DUKE1992A Allium schoenoprasum L. -- Chives Leaf 31,250 ppm
DUKE1992A Armoracia rusticana GAERTN. ET AL. -- Horseradish Root 31,150 ppm
DUKE1992A Cucurbita spp -- Summer Squash Fruit 30,855 ppm
DUKE1992A Brassica oleracea var. sabellica l. var. acephala DC -- Curly Kale, Kale, Kitchen Kale, Scotch Kale Leaf 30,000 ppm
DUKE1992A Brassica rapa var. rapa -- Rapini, Seven-Top Turnip, Turnip Root 30,000 ppm
DUKE1992A Solanum tuberosum L. -- Potato Tuber 30,000 ppm
DUKE1992A Allium ampeloprasum L. -- Elephant Garlic, Kurrat Leaf 29,811 ppm
DUKE1992A Cynara cardunculus subsp. cardunculus -- Artichoke Flower 29,780 ppm
DUKE1992A Rhus copallina L. -- Dwarf Sumac, Winged Sumac Leaf 29,760 ppm
DUKE1992A
now, go out and brew your own tailor-made ferts
cheers, Al
Great stuff. Keep it coming. 
