Aqueous extract of cotton has allelopathic effect on Raphanus sativus, Brassica campestris, Lactuca indica, Brassica campestris, Echinochloa crusgall, Setaria viridis and Abutilon theophrasti and its inhibition effect gradually strengthens with increasing concentration. Aqueous extracts from stems, leaves and roots of cotton inhibit or accelerate seed germination and seedling growth, and activity of enzyme of seedling root of cotton. While aqueous extracts from stems and leaves of cotton are 0.02 gmL^(-1), root length, shoot length, lateral root number and dry weight of cotton respectively increase by 10.3%, 3.1%, 22.9% and 2.4% over the control. The above mentioned indexes are lower than the control by 34.4%, 39.2%, 40.6% and 19.0% respectively as the aqueous extracts are 0.1 gmL^(-1). At the same time, root activity and SOD activity decrease by 38.2% and 36.7%, while POD activity and MDA content increase by 52.3% and 36.5%. Growth indexes of plant receptors increase at low concentrations but decrease at high concentrations of aqueous extracts. The allelopathic effect of aqueous extract of stems and leaves is stronger than that of root.

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It,s allelchemicals were isolated through extraction, thin-layer chromatography, and column chromatograpathy. After the white clover was infused in ethanol and evaporation, the leavings was dissolved by water. The aqueous extract was extracted by petroleum,chloroform, ethyl acetate and n-Butanol successively, and the bioassay showed that the chloroform phase has obvious inhibitory effect, the inhibitory rate was 44.32%,88.08% on Abutilon theophrasti M., seedling length and root length, 82.08%,92.16% on Echinochloa crusgalli L., seedling length and root length, and the Amaranthus retroflexux L., germination rate is 0, the secondly was ethyl acetate phase.

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The results indicated:0.1 mg/L 2,4-D or 0.1 mg/L 2,4-D+0.2 mg/L KT was optimal to induct the callus of carrot hypocotyls.The majority of the callus induced on the medium containing 0.1 mg/L 2,4-D regenerated embryoid,whereas,the callus induced on the medium containing 0.1 mg/L (2,4-D)+0.2 mg/L KT produced adventive buds.During the growth of regenerated plant,MS medium is available for rooting of seedling,and seedling regenerated on B5 medium must be placed on the B5 medium containing 0.1% IBA to develop root.

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A total of 197 F2 plants from the cross Chuanmai 42×Yr24/3*Avocet S and 726 F2 plants from Chuanmai 42×Yr26/3*Avocet S showed high resistance to CYR32 without segregations. Seedling testes with 26 PST isolates showed an identical reaction patterns for Chuanmai 42 (YrCH42), Yr24/3*Avocet S (Yr24) and Yr26/3*Avocet S (Yr26). In considering the allelic test of two F2 populations and seedling responses to 26 PST isolates as well as chromosome locations, YrCH42, Yr24 and Yr26 are likely to be the same gene.

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Theshort-day treatment period of balsam pear seedling should be 20 days fromthe day when the seedling was first emerged.

苦瓜苗期短日處理的時(shí)間一般以出苗開始20天左右為宜欧美大刁操大b。

This disease returns seedling of meeting enroach on to cause seedling corrupt, root end and bottom lamina blacken cankered; Coping of enroach on bine and Xie Ji ministry, ill ministry blackens cause heart corrupt, ill ministry gives out fragrance; Enroach on lamina causes the ill spot of strip form, it is first cinnamon, turn into hoar after.

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The results have shown that germinate rate of seed, weight of seedling, content of chlorophyl and Protein of seedling those were treated by SPEN for three generation exceed all. Two generations were treated by SPNE exceed one generation. Only was treated by SPEN at first generation still exceed CK of three generation.

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Wind bonds, the cold frame, the hotbed, the plastic awning and the greenhouse may cultivates each kind of vegetables seedling or the protection cold resistant vegetables seedling for the open ground and the protectorate winters.

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Results show that the change trend of growth is homogeneous, but it plays a different role in the growth of seedling height, ground diameter and leaf number; that for seedling height, peat soil is the best and red loam comes the next, for ground diameter, red loam is the best and peat soil comes the next and for leaf number, peat soil is the best, and red loam with nutrient soil named "zhidele" comes the next; and that in a growth season, the law of monthly increment of seedling height and leaf number is "fast-slow-fast-slow-stop" while the monthly increment of ground diameter is relatively stable.

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Result 2TYB-450 rice seedling seeder adopted the synchronous driving wheel, the equipment for vibrating and homogeneous sowing and the guiding sowing plate with seed box cross, so it didn't slip when driving and had high eligible ratio of sowing, good effect of filling seeds, less sowing seed number per seedling area and high working stability, with the sowing eligible ratio of 68.67%, the sowing blank-hole ratio of 1.89% and the sowing seed number per seedling area of 4.19. The working performance of 2FBS-840 seeder was next and that of MR-BZ840A seeder was worst.

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