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North Dakota Fertilizer Recommendation Tables and Equations | D.W. Franzen

soil test recommendation tables based on field research data obtained in North Dakota, South Dakota, western Minnesota and the Canadian Prairie Provinces.


Potassium Fertilization of Cotton | A. Ozzie Abaye; Extension Agronomist, Alternative Crops, Virginia Tech

Potassium (K) is an essential nutrient for normal plant growth and development, which plays a particularly important role in fiber development. Potassium defi¬ciency results in decreased fiber quality and lowered yields. If K is limited during active fiber growth, there is a reduction in the turgor pressure of the fiber result¬ing in less cell elongation and shorter fibers at maturity.

Evaluation of Controlled- release Fertilizers for Young Citrus Trees | Mongi Zekri and Robert C.J. Koo

Controlled-release sources of N and K were compared with soluble sources on young orange trees.The effects of these fertilizers on leaf mineral concentration, soil chemical analysis, and tree growth were evaluated for 3 years. Soluble fertilizers were generally more readily available but had shorter residual effects on leaves and soil than controlled-release fertilizers.

Potassium fertilization for pineapple: Effects on plant growth and fruit yield | Luiz Antonio Junqueira Teixeira, José Antonio Quaggio, Heitor Cantarella, Estêvão Vicari Mellis

A field experiment with pineapple was carried in the state of São Paulo, Brazil, with the objective of investigating the effects of rates and sources of potassium fertilizer on plant growth and fruit yield. Plant growth and fruit yield were evaluated. Biomass accumulation of pineapple plants was impaired by chlorine added with potassium chloride.

Managing potassium for crop production

A corn crop takes up nearly as much potassium (K) as it does nitrogen (N), yet management of each nutrient is entirely different. Whereas harvesting 125 bushels of corn grain per acre removes only 35 lbs of potash (K2O), harvesting 21 tons of silage per acre carries away 160 lbs of K2O; and the voracious appetite of a 5-ton per-acre alfalfa crop takes 230 lbs of K2O per acre from a field.

Potassium Requirements of Pulse Crops | Ch. Srinivasarao, Masood Ali, A.N. Ganeshamurthy, and K.K.

In India, pulses are grown mostly on marginal and sub-marginal lands without proper inputs. Many field experiments on various pulse crops show yield benefits from K application. Improved K supply also enhances biological nitrogen (N) fixation and protein content of pulse grains.



Fertigation in micro-irrigated horticultural crops: vegetables | Salvadore J. Locascio

Fertigation is the application of soluble nutrients via the irrigation water; its use in vegetable production has increased with the introduction of polyethylene mulch and drip irrigation, and it is an efficient means to apply fertilizer to the root zone.

Effects of fertigation regime on blossom end rot of vegetable fruits | Asher Bar-Tal and Benny Aloni

The relationships between blossom end rot (BER) of vegetable fruits and fertigation regimes are reviewed. Many fruit disorders are affected by nutrient deficiencies or unbalanced nutrition: BER, gold specks, green back, blotchy ripening, color spots, malformation, hollowness and fruit cracking.

Boosting seed cotton yields in punjab with potassium | M.S. Brar and K.N. Tiwari

Cotton production in India has stagnated at a level far below its potential - the main reason being unbalanced and low rates of fertilizers. A review of key research on improved potassium (K) management practices provides a clear picture of the potential yield and economic benefits available to farmers.

How potassium nutrition can suppress soybean aphids | Tom Bruulsema, Christina DiFonzo and Claudio Gratton

The soybean aphid has become the most important insect pest of soybeans in the North- east and Midwest regions of North America. It often damages soybean  plants that  are K-deficient more than  those  that  are not.