598 



Journal of Agricultural Research 



Vol. XIX 



Page 

 Muhlenbergia cuspidaia on northern Great 



Plains 65-72 



Murraea exotica. Syn. Chalcas exotica. 



Musa spp., hosts of Cosmopolites sordidus... . 39-46 



Navel orange. See Citrus sinensis. 



Nitrate — 

 potassium, effect on germination and 



growth 74-96 



sodium, effect on germination and growth. 74-96 



Nitrogen content — 

 change during development of barley ker- 

 nels 412-428 



of wheat, effect of freezing 183-186 



of kernels from normal and clipped barley 

 spikes 452-469 



Nonrutaceous plants, susceptibility ot Pseu- 

 domonas citri 34i 



Nux vomica, effect on milk and fat produc- 

 tion 124 



Oats. See Avena sativa. . 



Occurrence of the Fixed Intermediate, Hor- 

 deum intermedium haxtoni, in Crosses be- 

 tween H. vulgare pallidum and H. disti- 

 chon palmella (paper) S7S-S92 



Oil, castor, effect on milk and fat production . . 1 24 



Orange, navel. See Ctlrus sinensis. 



Orangelo, susceptibility to Pseudomonas citri. 356 



Orangequat, susceptibiUty to Pseudomonas 

 citri 357 



Orange-rusts of Rubus. See Gymnoconia 

 inter stitialis. 



Oxid— 



aluminum, in greensand 244 



calcium, in greensand 244 



ferric, in greensand 244 



magnesium, in greensand 244 



Oxytropis lamberti, on northern Great Plains . . 65-72 



Panicum dichotomiflorum, susceptibihty to 

 sugar-cane mosaic 134 



Paramignya longipedunculata, susceptibility 

 to Pieudomanas citri 345 



Parker, John H., et al. (paper): Genetics of 

 Rust Resistance in Crosses of Varieties of 

 Triticum vulgare with Varieties of T. du- 

 rum and T dicoccum 523-542 



Pears, Bartlett, ripening and storage 473-300 



Peltier, George L.,and Frederich, William J. 

 (paper): Relative Susceptibility to Citrus- 

 Canker of Different Species and Hybrids of 

 the Genus Citrus, Including the Wild Rela- 

 tives 339-362 



Pentoxid, phosphorus, in greensand 244 



Peronospora viaydis. Syn. Sclerospoa javan- 

 ica. 



Petalostemon — 



candidum on northern Great Plains 65-72 



purpureum on northern Great Plains 65-72 



Phihppine Downy Mildew of Maize (paper). 97-122 



Phosphate — 



calcium, effect on solubility of soils 50-51 



dipotassium, effect on germination and 

 growth 74-96 



Phosphoric acid. See Acid, phosphoric. 



Phosphorus pentoxid in greensand 244 



Physostigmine — Page 



effect on milk and fat production 124 



sulphate, effect on milk and fat produc- 

 tion 1 25-130 



Pigs, variation in economy of gain 225-234 



Pilocarpine, effect on milk and fat production 1 24 

 Pitutarian, effect on milk and fat production. 124 



Poly gala alba on northern Great Plains 65-72 



Poncirus trifoliaia, susceptibility to Pseudo- 

 monas citri 343>34S)347i348 



Potassium — 

 efi'ect of manure-sulphur composts on avail- 

 ability in greensand 239-256 



nitrate, effect on germination and growth. 74-96 

 sulphate, effect on germination and growth. 74-96 

 Potato, Irish. SiQ Solanmn tuberosum. 

 Practical Universality of Field Heterogeneity 

 as a Factor Influencing Plot Yields 



(paper) 279-314 



Presoak Method of Seed Treatment: A Means 

 of Preventing Seed Injury Due to Chemical 

 Disinfectants and of Increasing Germicidal 



Efficiency (paper) 363-39J 



Production of Conidia in Gibberella saubinetii 



(paper) 235-237 



Pseudococcus boninensis, failure to carry sugar- 

 cane mosaic 136 



Pseudom,onas— 

 avenae, causal organism of bladebhght of 



oats 167 



citri — 



behavior in soil 189-206 



decline in the soil 207-223 



relative susceptibiUty of species of 



Citrus 339-362 



Psoralea argophylla on northern Great Plains. 65-72 

 Puccinia — 

 coronata — 

 agropyri, pathogenic on Agropyron repens. 258 



pathogenic on oats 257, 265 



glumarum — 



on caryopses of Gramineae 258, 265 



resistance of wheats 526 



graminis — 



in Australia 257 



resistance of wheat crosses 523-542 



tritici — 



effect on germination 263 



effect on growth of seedlings 263-275 



parasitic on Hordeum jubatum 270 



resistance of wheat crosses 524-542 



malvacearum, pathogenic on hoUyhock 



seeds 259 



montanensis, pathogenic on Elymus cana- 

 densis 257 



simplex, pathogenic on barley kernels 258 



triticiiia, parasitic on wheat 265 



Pummelo. See Citrus maxima. 



Ragi. See Eleusine coracana. 



Raspberry, black, host of Gymnoconia intersti- 



tialis 501-507 



Ratibida columnaris on northern Great Plains . 65-73 

 Relative Susceptibility to Citrus Canker of 

 Different Species and Hybrids of the Genus 

 Citrus, Including the Wild Relatives 

 (paper) 339-362 



